# Heat

Heat

Heat is the opposite of cold. In thermodynamics heat means energy which is moved between two things when one of them is hotter than the other.
Adding heat to something increases its temperature, but heat is not the same as temperature.The temperature of an object is a measure of the average speed of the moving particles in it. The energy of the particles is called the internal energy When an object is heated, its internal energy can increase to make the object hotter. The first law of thermodynamics says that the increase in internal energy is equal to the heat added minus the work done on the surroundings.
Thermal energy is the type of energy that a thing has because of its temperature. In thermodynamics, thermal energy is the internal energy present in a system in a state of thermodynamic equilibrium because of its temperature.That is, heat is defined as a spontaneous flow of energy (energy in transit) from one object to another, caused by a difference in temperature between two objects; so objects do not possess heat.
Properties of Heat:
Heat is a form of energy and not a physical substance.Heat has no mass
Heat can move from one place to another in different ways:
·         Conduction
·         Convection