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In thermodynamics, the thermodynamic free energy is one of the state functions of a thermodynamic system (the others being internal energy, enthalpy, entropy...

A timeline of events in the history of thermodynamics. 1593 – Galileo Galilei invents one of the first thermoscopes, also known as Galileo thermometer...

A parhelic circle is a type of halo, an optical phenomenon appearing as a horizontal white line on the same altitude as the Sun, or occasionally the Moon...