Sentences with phrase «falling parcel of air»

The important point to note is that adiabatic descent involves a falling parcel of air contracting and heating despite there being no heat drawn by it from the surroundings.

BTW, please don't answer with something that tries to make the local thermal motion of single molecules into «lifting and falling parcels of air».

Not exact matches

Such changes in PE relative to KE result in density differences which cause different parcels of air to change their weights and rise or fall at different rates.

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

Now you want to assert that adiabatic lapse a phenomena that every single derivation of it requires a) that the gas be adiabatic, that is, a perfect insulator, which real gases (even ideal ones) are not; and b) be uplifting and downfalling — it is the «adiabatic expansion» that occurs as air parcels lift and fall due to variations in buoyancy that establish the rate, after all — some how lapses vertically along «real g» intead of horizontally opposite to the enormous density gradient due to 10,000 g that determines the actual direction of convection and buoyant force in the frame of the gas.

At the surface, increased pressure from injecting water vapour into a parcel of air via evaporation causes the parcel to rise so that surface pressure below it falls.

In fact the sensible heat or a portion of it gets radiated to space so the heated air parcel never becomes as light as it was when it contained water vapour so it becomes denser and heavier and must fall.