Thermodynamics is a branch of physics that deals with the relationship between properties such as energy, heat, work, pressure, density, temperature, etc. on a system.

There are three thermodynamic systems, open, closed and isolated:

  • Open system freely exchanges energy and matter with its surroundings. 
  • Closed system exchanges only energy with its surroundings, not matter.
  • Isolated system keeps the energy and matter within the system and everything else out. No transfer in or out.
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Nomenclature & Symbols for Engineering, Mathematics, and Scienceor 

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Freeze-Thaw Resistance
Gas Laws
Gay-Lussac's Law
Hagen–Poiseuille Law
Heat Capacity
Heat Capacity at Constant Pressure
Heat Capacity at Constant Volume
Heat Conduction
Heat Energy
Heat Flow Rate
Heat Flux
Heat Radiation
Heat Transfer
Heat Transfer by Conduction
Heat Transfer by Conduction Resistance Through a Cylindrical Wall
Heat Transfer by Conduction Through a Cylindrical Wall
Heat Transfer by Conduction Through a Plane Wall
Heat Transfer by Covection
Heat Transfer by Radiation
Heat Transfer Coefficient
Heat Transfer Coefficient of a Pipe Wall
Heat Transfer Rate
Henry's Law
High Pressure Steam