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State and explain the first law of thermodynamics ?
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The first law of thermodynamics is a form of law of conservation of energy applied to

a system. Mathematically it can be written as

$$Q=\triangle U+ W$$

where Q is heat energy, $$\triangle$$U is the change in the internal energy and W is work done.

Q is positive if heat is supplied to the system and negative if it is removed from the

system. $$\triangle$$U is positive if there is increase in internal energy and negative if there is

decrease in internal energy of the system. Work done W is positive if work is done

by the system (during expansion) and negative if work is done on the system (during

contraction). The heat energy supplied to a system can be used for increasing its

internal energy and for doing work.

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