Question

Properties of heat,cold ,hot

At microscopic scale , how will a hot body be diffeent from a cold Body?

When does heat flow between two bodies ?

Answer 1

Heat is a form of energy. When heat flows into a body, energy of the molecules increases whereby the vibration of molecules increases. If,liquid or gas, this change is readily visible because molecules travel randomly at a faster rate. This vibration produces heat due to collisions between molcules or atoms which gives the sensation of temperature in a body.

When a hot body is in contact with a cold body, the vibrational energy in the molecues transfers through the molecules. SO molecules of the cold body starts vibrating at a faster rate than the previous state and molecules of the hot body starts vibrating at a smaller rate.This is how heat transfers.