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In this video I will define and explain the 2 definitions of the 1st Law of Thermodynamics.
1) The change in the internal energy (of a gas) is equal to the heat added to the gas MINUS the work done BY the gas.
2) The change in the internal energy (of a gas) is equal to the heat added to the gas ADDED the work done ON the gas.

Next video in this series can be seen at:
https://youtu.be/w3MSXtOYivs