![]() ![]() ![]() The pressure gradient is also the reason low-density parcels are buoyed upwards. This weakening pressure lets ascending parcels of air push-out or expand, which results in an expenditure of temperature (eventually reaching the point where the water molecules on average no longer have enough kinetic energy left to overcome the intermolecular attraction force). ![]() At greater heights there is less air pressure (because there is less air column weighing down from above). The boundary is termed the lifted condensation level or dew point. There is not a specific limit to how far this misty air can be carried upward by air convection (producing billowy cloud tops), but if it falls below that specific height the droplets will sharply start evaporating away into invisibility (since only the non-gaseous, droplet form scatters white light). As hot moist air rises, there is a specific height where the gaseous water vapour begins to condense into a mist of tiny suspended liquid droplets. ![]()
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