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- Front In meteorology, generally, the interface or transition zone between two air masses of different density. Since the temperature distribution is the most important regulator of the atmosphere density, a front almost invariably separates air masses of different temperature. When warmer air replaces the colder, it is a warm front, and a front is a cold one when the opposite occurs.
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- Advection, Advection fog, Cold front, Convection, Electrons, Stable air mass, Warm front