Caloric theory and
Kinetic theory of
Heat
The caloric theory
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Heat is a fluid called caloric
Caloric flows from a hot object to a cold object when they are in contact
Friction creates small particles caused by the rubbing process and these particles produce
more caloric.
The kinetic theory
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All atoms have some form of motion
Heat is the kinetic energy of moving particles
The heat produced by friction is explained as the energy supplied when mechanical work
is done.
Evidence for the kinetic theory - Brownian Motion
Smoke cell
Evidence for the Kinetic theory - Diffusion in a
iquid