The Concept Of Heat
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All subjects are made up of molecules (molecule = a group of atoms).
If a drop of water, for example, is disturbed, it is possible to see how the molecules move rapidly about inside the drop.
The higher the speed of the molecules, the greater the movement energy they have.
What is called heat is a result of this kinetic energy that the molecules have temporarily.
The extent of the kinetic energy can be gauged directly with a thermometer.
Heat is a form of kinetic energy.
Little kinetic energy (the molecules move slowly) = low temperature.
High kinetic energy (the molecules move rapidly) = high temperature.
There are a number of different ways (different scales) to list the temperature.