Definition: The word 'advection' refers to a phenomenon where heat, water vapor, or other substances are carried away from a warmer area (the source) towards a cooler area (the sink). This occurs when the surface temperature rises due to an increase in pressure caused by air movement. Detailed definition of the word: Advection is the transfer of heat or matter, especially in the form of vapor or liquid, from a warmer region to a cooler one without the aid of conduction. It is often thought of as a mode of heat transfer, with the object that is heated being called the source and the object that is cooled being called the sink. For example, imagine a room where you have a heater on to warm your bed but then turn it off for the day because you're feeling the chill. The air moving through the room from hotter parts into cooler parts would be considered advection because it's transferring heat away from warmer areas (the source) towards cooler areas (the sink). Advection is crucial in the transfer of moisture or gases, as well as during the process of condensation and evaporation of water.
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