1.3 First Axiom of Thermodynamics

dU = δQ - dW Change of the inner energy =heat energy (into system)-work (performed by system) (1.2)

heat energy
not!! heat stuff: A scientific letter of the 19. century:
Blacksmith uses a hammer to form metal; the metal gets warm; the heat stuff flows from the hand into the metal; as a consequence the hand and the head of the blacksmith become cold!


U2 - U1 = Q - W (1.3)

p.s. pV -diagrams have been a company secret of James Watt for several years.
Thus he had a monopoly for good heat transforming machines.

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© J. Carstensen (Stat. Meth.)