2. The mirror can reflect light.
3. Solar eclipse and lunar eclipse-linear propagation of light
4. Liquefaction of rain, fog and dew
5. Frost and Snow-Ninghua
6. Mothballs gradually become smaller-sublimation
7. The water spilled on the ground is dry evaporation.
8. High pressure cooker temperature-the greater the air pressure, the higher the boiling point.
9. Refrigerator refrigeration-the refrigerant vaporizes and absorbs heat in the refrigerator.
10. The Kongming Lantern can be launched-the heating density of the gas becomes smaller.
1 1. When shooting watermelon, the voice is dull and deep-the pitch is related to the vibration frequency.
12. People always see lightning first and then hear thunder-the speed of light is faster than the speed of sound.
13. Clap your hands on the three-tone stone in the center of the echo wall, and you can hear three kinds of echoes-the sound reflects back after encountering obstacles.
14. When you see another person's eyes in the mirror, another person can see you-the light path is reversible.