What is the mathematical expression for first law of Thermodynamics? Also give its physical significance.
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Since the First Law of Thermodynamics states that energy is not created nor destroyed we know that anything lost by the surroundings is gained by the system. ... Therefore, q and w are positive in the equation
ΔU=q+w
because the system gains heat and gets work done on itself.
ΔU=q+w
because the system gains heat and gets work done on itself.
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