Thermodynamics is the branch of physics that deals with heat, energy, and work. The first law of thermodynamics says that energy cannot be created or destroyed, only converted from one form to another. So we can't create energy, only move it around. This helps when designing powerplants, for example.

The second law of thermodynamics states that the total entropy (disorder or randomness) of a closed system always increases over time. This means that over time a measure of "chaos" of a system increases, which means that it's not possible to "reverse" the passage of time globally, and we can only do it in small systems, which says a lot about how the universe is evolving.

The principles of thermodynamics are also fundamental in the design of refrigeration and air conditioning systems and in the design of combustion engines and turbines, and they provide an essential understanding of heat and temperature.
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