Question

In terms of molecules (מולקולות), what happens during warming is a significant increase in the amount of kinetic (קינטית) energy in each molecule. This will cause all the molecules to move, rotate, bend (hitpa'el, has ע) and be stretched (nif'al) much more than before, in the cold. In this way the space occupied by the same number of molecules (active trans) is larger. That is, the material expands (no ט). In the cold, the exact opposite happens - the molecules tend to be less dynamic (דינמיות) and, on average, to take up less space.

Answer 1

The underlying cause of thermal expansion is the increase in kinetic energy of individual atoms or molecules due to an increase in temperature. With increased kinetic energy, the atoms or molecules vibrate more rapidly and push each other apart, resulting in expansion of the substance. This expansion occurs in all dimensions.

Step-by-step explanation:

The underlying cause of thermal expansion is the increase in kinetic energy of individual atoms or molecules due to an increase in temperature.

In a solid, the atoms or molecules are closely packed and are held together by forces from neighboring molecules. With increased temperature, the kinetic energy of the atoms or molecules increases, causing them to vibrate more rapidly and push each other apart, resulting in an increased average distance between neighbors and expansion of the substance.

This expansion occurs in all dimensions and is a result of the random motion of atoms or molecules.