The first law of thermodynamics emphasizes that energy cannot be created or destroyed.
The first law of thermodynamics is usually written as
You need to look at the signs carefully; some other disciplines (chemistry, for example) may use other signs, which implies other definitions of these quantities.
1. Which physical law underlies the first law of thermodynamics?
a) conservation of matter
b) increase in entropy
c) conservation of energy
d) conservation of work
2. The quantity Q is the __________ that is added to the system.
d) internal energy
3.The quantity W in the first law refers to the __________.
a) work done on the system
b) work done by the system
c) change of energy in the system
d) change of volume in the system
4. The quantity ΔU in the first law of thermodynamics is the change in the __________ of the system.
b) internal energy
c) heat energy
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