The motion of atoms and molecules produces a form of energy that is present in all matter, called heat or thermal energy. ... Energy can take many forms, and from one form to another, it can alter. Many different energy forms can be transformed into heat energy
Heat or thermal energy is the form this energy possesses when it is being transferred between systems and surroundings. There is nothing material about heat. ... Heat is a form of energy that can be transferred from one object to another or even created at the expense of the loss of other forms of energy.
