Thermodynamics is a branch of physics that deals with energy, and the current science is based on three main principles. The first is the law of conservation of energy (energy cannot be destroyed) - which is applicable in many areas of engineering relating to power generation and temperature management. The second states that entropy (disorder or randomness) in a closed system increases over time - which is applicable to the design of heat management in engines. It also explains why perpetual motion machines are impossible. The third law law states that a perfect crystal has zero entropy at a temperature of absolute zero. This currently has little applicability in technology, though that may change as humans experiment with more technologies at super low temperatures.
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