heat is a delicate subject (generally for scientistis not us lol)
initially
only a hundreed lyears later
understanding how heat works is pretty new for a science
the best way to realize heat is when you have a cold and hot ojbect close tone oantoeher, there is a flow of something that equalizes the temperature of the two
thermal equilbrium
when the concept of energy was clarified, they realized that this kind of thing that flows between the 2o bject is just of an energy
because,