When a gas is heated it increases in pressure. The gas wants to reduce its pressure by expanding. If the gas can only go in one direction it will push things out of it’s way to go that direction.
A gas turbine heats air and has the air push a turbine. The turbine spins and that can be used to do work or produce electricity.
Steam turbines, gas turbines. and nuclear power plants all work the same basic way.
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