Thermal expansion and cold contraction are the basic properties of objects. Generally speaking, an object will expand when heated and contract when cooled. Most objects have this property.
Objects expand when heated and contract when cooled. This is because the motion of particles (atoms) in an object changes with temperature. When the temperature rises, the vibration amplitude of particles increases, which makes the object expand. However, when the temperature drops, the vibration amplitude of particles will decrease, thus causing the object to contract.
Everything expands with heat and contracts with cold. We can use this phenomenon to solve some difficulties in our daily life.
Pay equal attention to spirit and form.
Is to use language, calligraphy, painting to describe and express, the appearance is very real, the expression, posture and so on are very real.