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Why a heat engine with 100 % efficiency ...

Why a heat engine with 100 % efficiency can never be realised in practise ?

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The efficiency of heat engine , `eta=1-(T_(2))/(T_(1))`
The efficiency will be 100 % , or 1 , if `T_(2)=0K" or "T_(1)=oo`
Since , both these conditons cannot be attained practically , a heat engine cannot have 100 % efficiency .
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