Sentences with phrase «if parcels of air»

Thus, if a parcel of air from the surface rises (because of wind flowing up the side of a mountain, for example), it undergoes an expansion, from higher to lower pressure.

-- If a parcel of air is lifted, its pressure is DECREASED, since pressure decreases with height, and its temperature falls due to the expansion.

If a parcel of air loses pressure due to its air escaping to an adjoining parcel, then it makes sense that pressure will increase in the latter.

Indeed, if a parcel of air is moved adiabatically from the surfaceto aloft, the temparature drops accordingly.

Not exact matches

«CAPE is a measure of how potentially explosive the atmosphere is, that is, how buoyant a parcel of air would be if you got it convecting, if you got it to punch through overlying air into the free troposphere,» Romps said.

«For example, if the rover detects a dust storm, it may have an effect higher up because of the winds and the gravity waves (the bobbing up and down of a parcel of air) it sets up,» says Grebowsky.

Nullius: «A parcel of moist air will rise if it is moister than the air surrounding it — but why would it be?

If a small parcel of air rises by a slight amount, for any random reason, it will cool at the adiabatic lapse rate.

An parcel of ideal gas moving up or down the air column might be approximately follow an adiabatic expansion curve because air is a relatively poor conductor of air so the error made assuming it is adiabatic is small if the transport time is much shorter than the time for conduction to make secular changes in temperature.

The change in temperature with height of a parcel of air if relative humidity is less than 100 % dT / dz = g / cp Units = ms ^ -2 J ^ -1 kgK = ms ^ -2 kg ^ -1 m ^ -1 s ^ 2m ^ -1 kgK = Km ^ -1 g = gravity 9.81 ms ^ -2 cp = 1004 Jkg ^ -1 K ^ -1

This gets ride of hundred of words about about molecules interacting etc Then we get the isothermal case You did not comment on the fact that in the adiabatc case it needs a negligable amount of energy to raise a parcel of air from botton to top but if your silver wire delivers heat from the bottom layer to the top layer the outside work must be done to restore DALR.

Viscosity is to air what friction is to a book sliding across a table — even if you start the book with some velocity relative to a table (or a parcel of air with some velocity relative to other parcels) viscosity will quickly bring the motion to a halt.

A «parcel» of air, or «differential» volume of air in any macroscopic discussion is a volume large enough to contain enough molecules that thermodynamic averages pertain to the behavior of the parcel as if the air inside were a continuous fluid, so that when conducting this sort of discussion we can ignore the movement of individual molecules across the surface of (which are in detailed balance anyway, at equilibrium).

The expansion laterally increases pressure laterally but pressure from above stays the same because even if the atmosphere were to expand there would be the same number of molecules above the air parcel.

«In meteorology, convective available potential energy (CAPE), [1] sometimes, simply, available potential energy (APE), is the amount of energy a parcel of air would have if lifted a certain distance vertically through the atmosphere.

If the environmental lapse rate is larger than the dry adiabatic lapse rate, it has a superadiabatic lapse rate, the air is absolutely unstable — a parcel of air will gain buoyancy as it rises both below and above the lifting condensation level or convective condensation level.

Convection takes parcels of air upwards — and if this was the only process then the relative humidity (above the boundary layer) would be at 100 %.