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Doctors Medicines MCQs Q&A

Which one of the following represents unavailability?

Which one of the following represents unavailability? Correct Answer <span style=" line-height: 107%; ">T<sub style="">o</sub>(ΔS)</span>

Explanation:

Unavailability or Unavailable energy (UAE):

  • According to IInd law of thermodynamics complete conversion of heat into work is not possible. Only a part of heat can be converted into work.  

       

  • The maximum part of low-grade energy (heat) which is available for conversion is known as available energy.
  • The minimum part of heat which must be rejected is known as unavailable energy.

           OR

  • Unavailability is the product of the lowest temperature of heat rejection and the change of entropy of the universe during the process of supplying heat.

          i.e. UAE = To(ΔS)

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