The First Law of Thermodynamics
المؤلف:
Professor John W. Norbury
المصدر:
ELEMENTARY MECHANICS & THERMODYNAMICS
الجزء والصفحة:
p 220
30-12-2016
1979
The First Law of Thermodynamics
We have already studied this! The first law of thermodynamics is nothing more than a re-statement of the work energy theorem, which was
Recall that the total work W was always W = ΔK. Identify heat Q as Q ≡ WNC and internal energy (such as energy stored in a gas, which is just potential energy) is Eint ≡ U and we have
or
which is the first law of thermodynamics. The meaning of this law is that the internal energy of a system can be changed by adding heat or doing work. Often the first law is written for tiny changes as
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