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First Law of Thermodynamics

First law of Thermodynamics is identical to law Conservation of energy, which can be stated in any of the following forms.
  1. Energy can neither be created nor destroyed although it can be changed from one form to another.
  2. The total energy the universe is constant.
Expression for first law of thermodynamics is, ΔU = q + w

Where ΔU is the change in internal energy , q is the heat energy changes involved and w is the work done on or by the system.

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