Second Law of Thermodynamics

Written by Jerry Ratzlaff on . Posted in Thermodynamics

energy internalThe second law of thermodynamics (entropy) states that heat cannot pass from a cold body to a hot one by a self-acting process without the help of an external influence.  Entropy is the measure of disorder within a system. The more disorder within the system, energy becomes less available to do work.


Second Law of Thermodynamics formula

\(\large{ \Delta S = \frac {\Delta Q} {T}   }\)   


 Units English Metric
\(\large{ \Delta S }\) = entropy differential \(\large{\frac{Btu}{lbm-R}}\) \(\large{\frac{kJ}{kg-K}}\)
\(\large{ \Delta Q }\) = heat differential (energy) \(\large{\frac{Btu}{lbm}}\) \(\large{\frac{J}{kg}}\)
\(\large{ T }\) = temperature \(\large{R}\) \(\large{K}\)


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Tags: Equations for Energy Equations for Entropy