AP+Physics

Compressing a gas:

 * Work done __on__ a gas is __positive__; work done __on__ the environment is __negative__
 * Work done __by__ a gas is __negative__; work done __by__ the environment is __positive__ (I think of the gas as "losing" and the environment as "winning")

Expansion of a gas:
 * Work done __on__ a gas is __negative__; work done __on__ the environment is __positive__ (when the gas expands, it will cause the environment to be moved)
 * Work done __by__ a gas is __positive__; work done __by__ the environment is __negative__ (think of the gas as "winning", the environment as "losing")

Thermodynamics notes from NMSI Introduction to PV diagrams from NMSI. You will DEFINITELY see these on the AP exam!

[[file:JJohnsonthermo.pdf]] Hoover High's AP teacher's Thermo notes. Great review of stuff from Chemistry.
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