Heat and Hotness

The sensation of hotness is certainly familiar to all of us. When two

bodies, one hot and the other cold are placed in an enclosure, the

the hotter body will cool and the colder body will heat until the degree of

the hotness of the two bodies is the same. Clearly, something has been

transferred from one body to the other in order to equalize this hotness.

That which has been transferred from the hot body to the cold body is

called heat. Heat may be transferred into work. Therefore it is a form

of energy. Heated water, for example, can turn into steams, which can

push a piston.