efficient - reduces or avoids waste, friction - a force opposing the motion of surfaces in contact, joule - a unit of energy for kinetic and potential energy, transfer - move from one place or object to another, transform - change from one type to another, insulation - material that acts as a barrier to heat flow, thermal - to do with heat, circulate - move freely or continuously through an area, smog - a form of severe air pollution, temperature inversion - weather conditions that stop fresh air from circulating,

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