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LECTURE3 - Last Time System and Surroundings Energy(Kinetic...

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Last Time System and Surroundings Energy (Kinetic & Potential) Thermal energy (random kinetic) Heat – Flow of energy due to T difference Conservation of energy Heat capacity and specific heat capacity How we measure heat Heats associated with chemical reactions Work, w Pressure acting through a volume change: P = F / A (units N / m 2 = Pa), w = - F d = - (P A) d = - P V w = – P ext V Force acting through a distance: w = - F d e.g. Lift 1 kg up by 1 m: w = Pa m 3 = (N/m 2 ) m 3 = N m = kg m 2 /s 2 = J d A A d= V
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