Q and U from a They Might Be Giants wiki |
W represents work done on a gas. W cannot increase or decrease. W can be positive or negative; negative W means work is done BY a gas.
Q represents heat added to a gas. Q cannot increase or decrease. Q can be positive or negative; negative Q means heat is REMOVED from a gas.
U represents internal energy of a gas. U can increase or decrease.
This was all posted to a class folder yesterday, after I graded a problem about a PV diagram and the first law of thermodynamics. The 4 students who used illegal phrasology* such as "W decreases" lost credit. I thought it was worth a classwide reminder with our exam coming up today...
* penalty: 5 yards and loss of down
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