Question

what is heat?
heat is the energy needed to change the temperature of 1 g of a substance by 1°c.
heat is the average kinetic energy of the particles of a substance.
heat is the total energy of a substance due to the movement of its particles.
heat is the energy that flows between two substances of different temperatures.

Explanation:

Heat is defined as the energy transfer between substances due to a temperature difference. The first option describes specific heat capacity. The second option refers to temperature (average kinetic energy). The third option is internal energy (total energy of particles). The fourth option correctly aligns with the definition of heat.

Answer:

Heat is the energy that flows between two substances of different temperatures.