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Gallium arsenide (GaAs) Crystalline form of gallium and arsenic, which yields high-efficiency solar cells.

Galvanic cell See: Electrochemical cell

Gamma radiation Form of radiant energy consisting of high-energy particles of light. See also: Ionizing radiation

Gas 1. Fuel gas, such as natural gas, undiluted liquefied petroleum gases (vapor phase only), liquefied petroleum gas-air mixtures, or mixtures of these gases. Combustion of these gases produces CO2 and H2O. CO2 is a major contributor to greenhouse gas.