The temperature of the penny consequently rises. Water freezes at 273K and boils at 373K. 5. It is not possible even in principle to have a physical system at 0K. 6. A thermometer is a physical system in its own right. When someone touches a cold surface the perception of cold is the sensation of heat flowing from the body to the cold object.
Temperature is a measure of the average molecular kinetic energy of a body.
Temperature is a local property and doesn t depend on the size of the body. Heat is the flow of energy from one body to another whereas internal energy is the energy contained within a particular body. The relative temperature of two bodies in contact determines the direction of heat flow. Heat flows from hot to cold. A substance that heats up quickly has a low heat capacity.