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Scientifically     Competing factors:                     Energy and Entropy

Entropy, S = a measure of disorder

Total energy, U

Free energy = energy available to do work

Helmoltz free energy, A

A = U – TS  , T = Temperature

~ Most stable system has lowest possible free energy

~ 2nd law of thermodynamics:  Total entropy must stay constant or increase

~ Heat energy, example of disordered energy

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