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an energy-efficient HVAC system that uses natural gas or propane to power the heat transfer process, moving heat for heating and cooling spaces and water
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quantum theory of light says that matter and light is made out of tiny particles. The tiny particles in light are named photons.
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E=mc2 is an equation of energy and speed.This experiment happened in Switzerland.
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In Switzerland albert won the noble prize.They honoured him in physics and his famous equation E=mc2.
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Refrigerators were deadly in the 1920s because of the gases.people couldn't manege keeping there food cold without dying.