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Cool air is denser than warm air at the same pressure (see gas laws). Like a ball balanced on top of a hill, denser fluid lying above less dense fluid is dynamically unstable: Nike Huarache Qs if cool air is positioned above warm air, the former will sink and the latter will rise, the two volumes of air passing around and through each other, and perhaps mixing to some extent, until a stable condition (with denser fluid below and lighter fluid above) is achieved. The temperature near the ceiling of a room is consistently warmer than that near the floor. If a hydrostatic fluid is compressible, the criterion for dynamic stability is not simply that denser fluid must lie below light fluid, but that small perturbations must tend to correct themselves. When lower fluid is raised up into upper fluid, (during which process the density of the lower fluid decreases due to the drop in pressure), stability requires that it remain denser than the upper fluid, so that gravity pulls it back toward its original position. Some of the internal energy of the parcel is used up in doing the work required to expand against the atmospheric pressure, so the temperature of the parcel drops, even though it has not lost any heat.
Chrome etc) from a website you visit. They are stored on your electronic device. Equivalent potential temperature, commonly referred to as theta e , is a quantity related to the stability of a column of air in the atmosphere. is the Nike Huarache Pink And Black
vapor in the parcel were to condense, releasing its latent heat, and the parcel was brought adiabatically to a standard reference pressure, usually 1000 hPa (1000 mbar) which is roughly equal to atmospheric pressure at sea level. In stable conditions, increases with altitude. If decreases with height, convection can occur. The comparison of the equivalent potential temperature of parcels of air at different pressures thus provides a measure of the instability of the column of air.
temperature a parcel of air would reach if all the water Nike Huarache Flight
arrived it would be even colder than the air already there, due to adiabatic cooling; it would be heavier than the ambient air, and would sink back toward its original position. Similarly, if a parcel of cold mountain top air were to make the trip down to the valley, it would arrive warmer and lighter than the valley air, and would float back up the mountain. So cool air lying on top of warm air can be stable after all (as long as the temperature decrease with height is less than the adiabatic lapse rate); the dynamically important quantity is not the temperature, but the potential temperature the temperature the air would have if it were brought adiabatically to a reference pressure. This occurs because the vapor pressure of water decreases at lower temperatures (s.
Conversely, a sinking parcel is compressed and becomes warmer even though no heat is added. Air at the top of a mountain is usually colder than the air in the valley below, but the arrangement is not unstable: if a parcel of air from the valley were somehow lifted up to the top of the mountain, when it Nike Huarache Navy Blue And Black
Nike Huarache Qs
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