Why isn't heat matter
Heat is not considered as matter because it is not a substance or a physical entity. Instead, heat is a form of energy. Matter, on the other hand, refers to physical substances that have mass and take up space.
Heat is transferred between objects or systems that have different temperatures, causing a transfer of energy. It is a measure of the total kinetic energy of the particles (atoms or molecules) in a substance or system. When there is a temperature difference between two objects, heat flows from the object with higher temperature to the object with lower temperature until they reach thermal equilibrium.
The concept of heat is closely related to the movement and behavior of particles within matter, rather than being matter itself. So while heat is an important aspect of thermodynamics, it is not considered matter.