Second Law of Thermodynamics
What is it?
The Second Law of Thermodynamics states that it is impossible to completely convert heat energy into mechanical energy. Another way to put that is to say that the level of entropy (or tendency toward randomness) in a closed system is always either constant or increasing.
Give me an example!
Have you ever felt the heat from exhaust coming out of the tailpipe of a car? Automobile engines are designed to convert the heat energy resulting from the combustion of gasoline into mechanical energy. However, this process does not function with 100% efficiency - and proof of that is the heat lost along with the exhaust gasses.
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