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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site first law of thermodynamics Also known as the law of conservation of energy, the principle that energy cannot be created or destroyed, but only changed from one form to another. First law efficiency measures the fraction of energy supplied to a device or process that it delivers in its output. Related categories    • BASIC SCIENCE Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP