From 'The Nature of Science' by James Trefil:

In an isolated system - TOTAL ENERGY REMAINS CONSTANT (Energy of motion and position)

HEAT flows from HOT to COLD

Transfer occurs by CONDUCTION; CONVECTION (movement of matter); and RADIATION (wavelengths).


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A number of these points are also described in 'A Matter of Degrees', by Gino Segre:

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