Thinking: Do you know what determines the water pressure?
Material: 1 rectangular vertical carton containing milk, 1 rolled tape, 1 nail, water, flat plate.
Operation:
1. Put away the milk carton and poke three holes on both sides with nails. The positions of the three holes are bottom, middle and upper respectively.
2. Seal the three holes with adhesive tape.
3. Fill the paper box with water.
4. Place the flat plate under the perforated side and tear off the adhesive tape. Observe the difference of water spraying from three holes.
Explanation:
1. The experiment shows that the water at the bottom is sprayed farthest, followed by the water in the middle, and the water at the top is sprayed nearest.
2. The pressure of water is determined by the depth. The deeper the water, the greater the pressure. The deeper the water is, the less pressure there is.
Create:
If you can swim, you can feel the pressure of water in the water. Keep your head at different depths, and you will feel the pressure on your ears is different.
Pascal barrel crack
Thinking: Plastic bottles are filled with water after several knife marks are made on the side wall. Why doesn't water flow from the knife marks?
Materials: plastic bottles, knives, rubber bands, funnels, straws, plasticine.
Operation:
1. Take a plastic bottle, use a knife parallel to the side wall to draw several knife marks on its side wall (cut the side wall), and then tie the plastic bottle around the knife marks with a rubber band. Put a straw on the plastic bottle cap and seal it with plasticine.
2. Connect the funnel with a straw.
3. Hold the funnel so that it is flush with the bottle mouth, and then fill the funnel with water until both the plastic bottle and the funnel are filled with water. At this time, there is no water in the knife mark of the plastic bottle. Hold the funnel high and water will flow out at the knife mark.
Explanation: The pressure produced by the liquid in the container on the bottom (or side wall) of the container can be much greater than the weight of the liquid itself.
Note: It is dangerous to use a knife. Please ask your parents for help.
Pen cap diver
Thinking: Why can a submarine dive into the water and return to the surface? Let's be a diver's toy!
Materials: plastic pen cap 1, plasticine 1, water 1 cup, mineral water bottle 1.
Operation:
1 Stick plasticine on the bottom of the pen cap. (The cap can't have a hole)
Fill the water bottle, put the pen cap in the bottle and tighten the bottle cap.
Squeeze the bottle hard and watch the cap sink to the bottom of the bottle.
Let go of your hand and return the cap to the top of the bottle.
Explanation:
1 The air in the pen cap makes it float.
2 Water pressure enters the pen cap, which is heavier and sinks.
Water flows out of the cap, and the cap becomes lighter and rises.
Creation: Can you make a different diving toy?
Table tennis that can't be washed out
Thinking: Why can't water wash away table tennis?
Materials: one ping-pong ball and one washbasin.
Operation:
1, take a big washbasin, put it under the faucet, turn on the faucet and put half a basin of water first.
2. Then take a ping-pong ball and put it on the landing point of the current. I saw that table tennis was firmly "imprisoned" in the current, as if it had been absorbed. No matter how big the water is, it will not "drive it out".
Description: the water near table tennis has high speed and low pressure; The water in the outer layer has low velocity and high pressure, and the surrounding pressure is basically equal. It can only roll in the water, and it will never run out unless the faucet is turned off.
Creation: What will happen if table tennis is replaced with balls made of other materials?
Hang eggs in water.
Thinking: Think about how to keep eggs from floating or sinking in the water, but floating in the water.
Ingredients: two glasses, water, salt, blue ink, chopsticks and eggs.
Operation:
1. Put one third of water and salt in the cup until it can't dissolve.
2. Fill another cup with clear water, drop one or two drops of blue ink and dye the water blue.
3. Take a chopstick and slowly pour out the blue water in the cup along the chopsticks.
The bottom of the glass is colorless salt water and the top is blue fresh water.
5. Gently and slowly put an egg into the water. It sinks into the blue water, but floats on the colorless salt water, hovering at the boundary between the two layers of water.
Explanation:
Raw eggs have a higher relative density (specific gravity) than water, so they will sink. The relative density of salt water is greater than that of eggs, and eggs will rise.
Create:
Can you do this experiment with another solution?
Volcanic eruption
Thinking: Do you know? One kind of water will float on top of another and make an underwater "volcano" eruption. Let's observe this phenomenon.
Material: 1 glass jar or basin, a little hot and cold water, a little ink, 1 small bottle with lid.
Operation:
1 Pour 3/4 cold water into the glass jar.
Fill the bottle with hot water, add a few drops of ink, tighten the bottle cap and shake it evenly.
3 Put the vial on the bottom of the cylinder and unscrew the lid.
Observe the ink sprayed on the water surface: the hot dyeing water forms a layer on the cold water.
After cooling, the dyeing water will be mixed with cold water.
Explanation:
1, the hot water in the bottle is weak.
2. The density of hot water is less than that of cold water.
The stroke of water polo
Thinking: Is the water polo in cold water the same as that in hot water?
Materials: 2 transparent glasses, 1 balloon, half a cup of cold water and half a cup of hot water.
Operation:
1. Fill the balloon with water and tie it with a rope.
2. Put the water polo in a cold water cup, and the water polo floats in cold water.
Put the water polo in a hot water cup, and it will sink to the bottom.
Note: The densities of cold water and hot water are different. The relative density of cold water is greater than that of hot water, so water polo will sink in hot water and float in cold water.
Creation: There is a difference between the density of cold water and hot water. Can it be proved by other experiments?
Unbreakable handkerchief
Thinking: Why didn't the burnt handkerchief burn out?
Materials: handkerchief, glass, iron wire, alcohol, matches, water.
Operation:
1. Mix two parts of alcohol and one part of water, and soak the handkerchief in the alcohol mixed with water.
Take the handkerchief out of the cup, wring the water a little, and then hang it on the wire.
3. Light the handkerchief with a match, and the burnt handkerchief is intact.
Explanation:
1. There are two parts of alcohol and one part of water in the glass. Alcohol has a low ignition point and handkerchiefs burn quickly.
2. Alcohol can easily volatilize from the handkerchief and burn, and some water remains on the handkerchief to protect it.
3. In the process of alcohol burning, a part of water turns into steam to volatilize, and these volatilized steam takes away a part of the heat of the cloth, thus reducing the temperature of the handkerchief, and the handkerchief will not be burned.
Burning cotton thread
Thinking: Why does cotton thread keep burning?
Materials: a cotton thread, a glass of water, salt, chopsticks and matches.
Operation:
1. Add salt to a glass of clean water and stir with chopsticks until the salt no longer dissolves.
2. Soak a cotton thread in the prepared concentrated salt water, take it out and put it on the table to dry.
3. Lift the dried cotton thread by hand and light a match to light the cotton thread.
4. The cotton thread is burned from the lower end to the upper end, and the burnt thread ash still does not look like a thread.
Note: salt can't be burned. When the cotton thread soaked in concentrated salt water burns, the cotton thread inside has been burned out, but the salt shell wrapped outside the cotton thread still remains. So, what we see is burning cotton thread.
The burning of sugar
Thinking: Son, will sugar burn? Under what conditions can sugar burn?
Material: 1-2 pieces of sugar, 1 box of matches, a little ash, 1 plate.
Operation:
1 Put the sugar cubes on a plate and light them with a match to see if the sugar burns.
Put a little ash on the sugar and light it with a match to see if the sugar will burn.
Explanation:
1 sugar is not easy to burn in direct contact with fire.
Put a little ash on the sugar, burn it at a higher temperature to reach the ignition point, and the sugar will burn.
Creation: Do you know how to put out the burning flame? Try to make a fire extinguisher.
Water magnifying glass
Thinking: Water can also be a magnifying glass, you know?
Materials: water, plastic wrap, 1 bowl, colored beads.
Operation:
1. Put the colored beads into the bowl and seal the bowl with plastic wrap.
2. Gently press the plastic wrap on the bowl mouth by hand, so that the plastic wrap becomes an inverted cone.
3. Pour the water on the plastic wrap, look at the objects in the bowl through the water, and observe how the colored beads are different from usual.
Description: The items in the bowl look much bigger, because the water on the plastic wrap looks like a convex lens, and the objects seen through the convex lens are often larger than the original shape.
Chromogenic iodine
Thinking: Does iodine change color when it meets a burning match?
Materials: 1 glass bottle with lid, 1 bottle of iodine, 1 box of matches, a little water.
Steps:
Pour about 30ml of water into the 1 glass bottle.
Add two or three drops of iodine to the water and observe the color.
Use 2-3 matches at the same time, put them into a bottle for burning immediately after lighting, and cover the bottle mouth with a bottle cap.
Shake the bottle and observe the color change.
Explanation:
1, and the liquid color is brown.
2. The smoke of matches can turn iodine into colorless iodine ions, so the iodine solution in the bottle will become colorless and transparent water solution.
Creation: Matches contain some flammable substances. When you light a match, do you smell a smell other than fire? What kind of pollution will it bring?
Spoon magnet
Thinking: Do you know why the metal spoon becomes a magnet?
Materials: metal spoon, magnet, nail, paper clip.
Operation:
1, suck nails and paper clips with a metal spoon.
2. Prepare a metal spoon and rub it back and forth slowly with a magnet in your hand.
3. The spoon sucked the nails and paper clips.
Knock the spoon on the table, and the magnetic force of the spoon disappears again.
Explanation:
The metal substances that make up the spoon can be regarded as small magnets, but because their magnetic fields are in different directions, their effects cancel each other out, and the whole spoon has no magnetism. However, if the magnetic field of the small magnet inside the spoon is forcibly arranged in the same direction by the magnetic force of the real magnet, the spoon will show magnetic force. When the spoon hits the table, the arrangement of small magnets inside is destroyed again, and the magnetic force of the spoon disappears.
Creation: What else can be magnetized? What material should be used for magnetization?
A pile of coins that will drop automatically.
Thinking: Why does a pile of coins lying on the table automatically fall down?
Material: ten coins, magnets.
Operation:
1. Fold ten coins into a neat cylinder and put them horizontally on the table.
2. Place a magnet 2-3cm above the coin, close to a stack of coins placed horizontally on the table.
The coins placed horizontally on the table will fall automatically.
Explanation:
Due to the change of this stack of coins under the action of magnetic field, the upper end of each coin is magnetized respectively. Due to the repulsion of the same sex and the close contact between coins, under the action of magnetic repulsion, this pile of coins lying across the table will automatically fall down.
Create:
Can you do some other small experiments with magnets?
Hercules paper
Thinking: Can you imagine that a piece of paper can lift a book? Do you know how to do it?
Material: paper, tape, 1 book.
Operation:
1. Put the paper on two books opened side by side, leaving the middle part of the paper hanging. Put a book in the air of paper.
2. Roll the paper into a paper roll and stick the edges of the paper with tape.
3. Stand up the paper roll and put a book on it.
4. Think about the difference between these two methods.
Explanation:
1. How much pressure a piece of paper can bear mainly depends on the bending moment when the paper is stressed. Bending moment is the distance between the stress point and the reaction point of paper. The greater the bending moment, the greater the force the paper bears, and vice versa.
2. If the weight is placed directly on the paper, the stress point and reaction point of the paper are almost in the same position. So when the bending moment is small, the force is also small.
3. Put the heavy object on the vertical paper roll, the bending moment of the paper is greater, so the force is greater.
Create:
Think about what shape this paper can be folded into to bear the pressure.
Different bearing capacity
Thinking: Why does the bearing capacity of cardboard change after deformation?
Material: 1 paper card (30×20cm), two paper boxes of the same height, and several coins.
Operation:
1. A piece of cardboard is laid flat on a carton of the same height, and only two coins can be put on the paper.
2. Fold the paper card into waves and put it on the paper box with the same height. Many coins can be placed on corrugated cardboard.
Explanation:
Corrugated cardboard carries more coins than flat cardboard.
Create:
How to change the paper jam and put more coins on it?
Marking ink
Thinking: As long as a blank piece of paper is baked with fire, a glyph pattern will appear. Can you make this invisible ink?
Material: 1 brush, 1 lighter, 1 cup of sugar water, 1 piece of white paper.
Operation:
1. Write or draw on paper with a brush dipped in sugar water.
2. After drying, look at the fonts and patterns.
3. Bake it with a lighter and see what changes there are.
Explanation:
1. After drying, glyphs and patterns will disappear.
2. After baking, glyphs and patterns will appear light brown due to sugar dehydration.
Creation: Try what other liquids can be used as invisible ink besides sugar water.
The hardness and fragility of eggshells
Thinking: Do you think the eggshell is strong or fragile? When is it easy to break and when is it not easy to break?
Materials: cups (cups with the same diameter as half eggshells), two half eggshells, and a thin iron bar.
Operation:
1, the eggshell opening is buckled down at the cup mouth.
2. Take a thin iron bar and drop it vertically down on the eggshell at a height above 10 cm, so that the eggshell is not broken.
3. Place the eggshell with the opening facing up on the cup mouth.
4. Take a thin iron bar and throw it vertically downward at a height above the eggshell 10 cm, and the eggshell will be smashed.
Explanation:
1. The iron bar hits the concave part of the eggshell, and the force is borne by the breaking point, which is easy to break. When the iron bar touches the convex part of the eggshell, its strength is scattered and it is not easy to break.
2, the same material, the same impact force, different angles, the effect is completely different.
Table tennis jumps in the air.
Thinking: Do you think table tennis will be blown away when the hair dryer is up?
Materials: table tennis 1, hair dryer 1.
Process:
1. Hold the hair dryer in one hand and put the ball above the hair dryer in the other.
2. Start playing table tennis with cold air or hot air.
Description:
1. The hair dryer blows the table tennis up. Because of the balance of forces, table tennis will not be blown away, but will float in the air.
2, cold air or hot air blowing table tennis, the effect is the same.
Extension:
What will happen if table tennis is replaced by water?
Who has the greatest strength?
Thinking: Dovetail clip or lock, which is heavier? Tie a line between the two to see who has greater "power".
Material: 1 string, 1 ballpoint pen, 1 small metal wrench (metal object heavier than clip), 1 clip.
Operation:
1, put a rope about 50 cm long on the rod of the ballpoint pen, one end of the rope is tied with a clip, and the other end is tied with a small metal wrench heavier than the clip.
2. Hold the vertical pen holder in the palm of both hands, with one end of the small metal wrench facing down.
3, slowly rub the pen, let the clip do circular motion, gradually accelerate the rotation, and see what happens.
Explanation:
1, the small wrench is heavier than the clamp.
2. When the rotating speed is accelerated, it will generate greater centrifugal force and lift the metal small wrench upward.
Create:
In addition to the difference in weight, if you add different speeds to an object, it will produce different momentum. Compare and see, what's the difference between walking and cycling and rain hitting your face?
Copy fingerprints
Thinking: press hard on the paper with your finger belly to see if there are any traces left on the paper. How can you see your fingerprints?
Materials: iodine, cut cans, candles, white paper, matches.
Operation:
1, print fingerprints on white paper.
2. Take a look at whether there are fingerprints on the white paper.
3. Put a small amount of iodine in the iron box.
4. Light the candle and let the iodine be heated above the candle (until the iodine dries and emits purple vapor), and the white paper with fingerprints is facing the vapor.
5. After a while, light-colored fingerprints will appear on the paper.
Explanation:
1. Why are fingerprints on paper? It turns out that there is always some grease on the surface of human skin, which plays a role in protecting the skin. Fingerprints on the skin surface come from unevenness, with more grease in low places and less grease in high places. When the belly of the finger is pressed on the paper, the oil is absorbed by the paper, and the oil distribution on the paper is uneven, but it is the same as that on the fingerprint.
2. Iodine turns into gas when it is heated, and directly turns into solid when it is cold. It is easily dissolved in oil, so fingerprints of different colors will appear on the paper.
The candle went out.
Thinking: What other ways to blow out candles with your mouth?
Materials: 1 candle, a little baking soda, a little vinegar, 1 box of matches, 1 bowl.
Process:
1 Drop a few drops of wax oil on the candle lit in the center of the bowl and fix the candle in the bowl.
Put baking soda around the candle and pour some vinegar into the bowl.
The candle went out.
Description:
1. Adding vinegar and baking soda will produce carbon dioxide gas.
After the carbon dioxide gas is produced, the candle will go out.
Extension:
Think about it, what are the conditions for the candle to go out? Do you know any other ways to put out candles?
Light candles in the air
Thinking: The match is lit above the candle. Why do candles burn?
Materials: candles, matches
Operation:
1, light a candle
The top of the candle that burned for a while burned into a cup.
2. Blow out the lighted candle.
3. Smoke emitted after candles are blown out.
When a match is used to light the smoke from the candle that has just been extinguished, the candle will be re-lit immediately.
Explanation:
After lighting the candle, you can see that the wax at the top of the candle is slowly melting, and the top is obviously burned into a cup. The "cup" is filled with melted candle oil. Then, the candle oil climbs up along the wick, reaches the ignition point at the upper end of the wick, and burns. Under the action of heat generated by combustion, candle oil will vaporize into "smoke". Obviously, "smoke" is the gaseous state of wax.
Creation: Do you know what the gaseous state of water is? How can you make steam?
Paid newspaper
Thinking: Without glue, tape and other things, newspapers can stick to the wall without falling off. Do you know why?
Material: 1 pencil; 1 newspaper.
Steps:
1. Spread the newspaper and lay it flat on the wall.
2. After a few quick rubs on the newspaper with one side of the pencil, the newspaper won't fall off just like sticking to the wall.
3. Lift a corner of the newspaper, and then let go, and the lifted corner will be sucked back by the wall.
Take the newspaper off the wall slowly and pay attention to the static sound.
Description:
1. Wipe the pencil to charge the newspaper.
2. The charged newspaper was sucked to the wall.
When the indoor air is dry (especially in winter), if you take down the newspaper from the wall, you will hear the crackle of static electricity.
Creation: Please have a try. What else can be stuck to the wall by static electricity without glue?
Separation of pepper and salt
Thinking: I accidentally mixed the kitchen condiments: pepper and salt. How can I separate them?
Ingredients: pepper, salt, plastic spoon, small dish.
Operation:
1. Mix salt and pepper.
2. Stir well with chopsticks.
3. Rub the plastic spoon on the clothes and put it on the salt and pepper.
4. Pepper sticks to the spoon first.
5. Move the plastic spoon down slightly.
6. After salt, stick it on the spoon.
Explanation:
Pepper is electrostatically adsorbed earlier than salt because its weight is lighter than salt.
Create:
Can you separate other mixed materials in this way?
Inflatable balloon
Thinking: When will two balloons attract each other and repel each other?
Material: 2 inflatable balloons, 1 string, 1 cardboard.
Operation:
1 Inflate two balloons separately and tie a knot in your mouth.
Connect two balloons with a thread.
Rub the balloon on your hair (or sweater).
Lift the middle part of the rope and the two balloons will separate immediately.
Put the cardboard between two balloons, and the electricity on the balloons makes them attracted to the cardboard.
Explanation:
The electricity on one balloon repels the electricity on the other balloon.
The electricity on the two balloons attracts them to the cardboard.
Creation: Can other small experiments be used to illustrate that balloons are charged?
Lovely watermark
Thinking: The beautiful patterns on rice paper are not drawn, but how are they made?
Materials: 1 washbasin, 1-2 rice paper, 1 chopsticks, 1 cotton swab, 1 bottle of ink and water (about half a basin).
Operation:
1. Pour half a basin of water into the washbasin and gently touch the water surface with chopsticks dipped in ink. You can see that the ink expands into a circle on the water surface.
2. Wipe the scalp with a cotton swab for two or three times.
3. Then touch the center of the ink circle and see what happens.
4. Gently cover the calligraphy paper on the water, and then pick it up slowly. What patterns are printed on the paper?
Explanation:
1. When the cotton swab touches, the ink will swell into an irregular circular pattern.
2. A small amount of oil on the scalp rubbed by cotton swabs will affect the mutual pulling force of water molecules.
3. The watermark will present irregular concentric circles.
Create:
Try other methods to change the ink pattern on the water surface.
Switching flow
Thinking: Why does a stream of water become a stream when you touch it with your hand?
Material: a tin can, awl, water.
Operation:
1. Drill five holes in the bottom of the empty iron box with nails (the spacing between the holes is only about 5 mm).
2. Fill the water tank with water, and five streams of water flow out from five small holes.
Twist these streams together with your thumb and forefinger.
When the hand is removed, the five streams of water will merge into one.
If you wipe the small hole in the jar with your hand again, the water will become five strands again.
Explanation:
The surface tension of water makes the water flow on and off.
Floating needle
Thinking: Why does the needle float on the water?
Ingredients: a bowl of water, needle, fork, detergent.
Operation:
1, pour a glass of water in the cup.
With a fork, carefully put a needle on the water.
Move the fork slowly, and the needle will float on the water.
Drop a drop of detergent into the water and the needle will sink.
Explanation:
1, it is the surface tension of water that supports the needle so that it will not sink. Surface tension is the cohesive connection formed by water molecules. This cohesive connection is due to the fact that some molecules are attracted together and the molecules squeeze each other to form films. This kind of film is called surface tension, which can hold the object that should sink.
2, detergent reduces the surface tension, the needle will not float.
Attention: The needle is dangerous, please ask parents to help you operate it.
Magic toothpick
Thinking: Will the toothpick in the water swim with the sugar cubes in the water or with the soap in the water?
Ingredients: toothpick, a basin of water, soap, sugar cube.
Operation:
1. Carefully put the toothpick on the water.
2. Put the sugar cubes in the basin, away from the toothpicks. The toothpick will move towards the sugar cube.
Change a basin of water, carefully put the toothpick on the water, and now put the soap in the basin near the toothpick. Toothpicks will stay away from soap.
Explanation:
When you put the cube in the center of the basin, it will absorb some water, so there will be a small water flow in the direction of the cube, and the toothpick will move with the water flow. However, when you put soap into the basin, the surface tension at the edge of the basin is strong, so you will pull the toothpick out.
Creation: Please try. If sugar and soap were replaced by other substances, which direction would the toothpick swim?
Perforated paper can hold water.
Thinking: Why can perforated paper block water?
Material: a bottle, a pin, a piece of paper, a full cup of colored water.
Operation:
1. Fill the empty bottle with colored water.
Punch many holes in the white paper with a pin.
3. Cover the bottle mouth with perforated paper.
4. Hold the paper with your hand, turn the bottle upside down, and make the bottle mouth face down.
Gently remove your hand, the paper will cover the bottle mouth and the water will not flow out of the hole.
Explanation:
A thin piece of paper can hold up the water in the bottle, because atmospheric pressure acts on the paper, producing upward tension. Water will not leak out from the small holes because water has surface tension, and water forms a water film on the surface of paper, so water will not leak out. This is like an umbrella made of cloth. Although this cloth has many holes, it still won't leak rain.
The secret of handkerchief
Thinking: Lay the handkerchief flat under the faucet and turn on the faucet. Does the water run down through the handkerchief?
Material: 1 glasses, 1 handkerchief, 1 rubber band.
Process:
1. Cover the cup with a handkerchief and tie it with a rubber band.
2. Let the water flow on the handkerchief.
3. Turn off the tap after the water flows into the cup for about seven or eight minutes.
4. Turn the cup upside down.
Description:
1. When flushing from the top of the cup, water will flow into the cup through the handkerchief.
2. When the cup is inverted, water will not flow out due to atmospheric pressure.
Extension:
If the cloth covering the handkerchief is different (such as cotton cloth or towel or linen), what will happen to the incoming and outgoing water?
Plastic backing plate that won't fall off.
Thinking: Cover a cup full of water with a pad. Will the backing plate fall off when the cup mouth is facing down?
Materials: two glasses, water and a plastic plate.
Operation:
1. Fill the glass with water.
2. Cover the cup with a pad.
Hold the cup in one hand and the mat in the other.
4. Hold it by hand, turn the cup mouth upside down, and let the cup mouth face down.
Let go of the hand holding the pad gently, and the pad won't fall off.
Explanation:
The cushion is covered on the mouth of the cup containing water, because the air pressure outside the cup is relatively high, and the cushion will not fall off.
Create:
There is not enough water in the cup, or what if there is no plastic plate? Please try it.
The candle won't go out.
Thinking: Blow out the burning candle hard, but it won't go out. Do you know how to do it?
Material: 1 candle, match, 1 small funnel, 1 flat.
Operation:
1. Light the candle and fix it on the flat plate.
2. Let the wide mouth of the funnel face the flame of the candle, and blow the flame forcefully from the small mouth of the funnel.
3. Let the small mouth of the funnel face the flame of the candle, and blow the flame forcefully from the big mouth of the funnel.
Explanation:
1. When blowing in this way, the flame will deviate to the wide mouth end of the funnel and will not be easily blown out. If you blow from the wide mouth of the funnel, the candle will go out easily.
2. The blown gas gradually empties from the narrow mouth to the wide mouth, and the air pressure is weakened. At this time, the gas around the funnel wide mouth will flow into the funnel wide mouth because of the strong air pressure. Therefore, the flame of the candle will also rush to the wide mouth of the funnel.
Attention: Pay attention to the safety of candles when burning.