Second Law of Thermodynamics
The 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
\(\large{ \Delta S = \frac {\Delta Q} {T} }\) |
Where:
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 | \(\large{R}\) | \(\large{K}\) |