Warm air is more
dense than cold air, so it holds more moisture.
Hot air is less
dense than cold air, and the hotter the temperature, the more speed a plane needs to lift off.
The air particles speed up, in other words their temperature increases, the hotter air is less
dense than colder air above and hence moves up (convection).
Not exact matches
Light travels faster in the hot, thin
air close to the road
than it does in the
cold,
dense air above, and that difference in speed is what causes it to shift direction as it crosses the boundary between the two.
Keeps hot
air out of intake system and delivers
denser air at
colder temps
than factory
air intakes
Cold air is more
dense than hot
air so itsinks and warm
air is less
dense so it rises.
Since
cold air is more
dense, atmospheric pressure decreases more rapidly with height on the poleward side of the polar front
than on the warmer tropical side.
Factor in the fact that soils amd water are at least ~ 1000 times more
dense than air and the idea that gases can heat warmer surfaces like soils and especially water whilst most of the atmosphere is actually much
colder just seems - well — ludicrous.
Warm
air holds more moisture, it is less
dense so lighter
than cold air.
The
air around being
colder therefore
denser and heavier, with more condensed volume, will sink; gravity having less of a grip on the hotter less
dense rising expanding lighter volume with less mass
than it does on the
denser colder heavier with more mass.
A volume of
air heated will become less
dense expanding in volume and rise because lighter
than the
air around it which is
colder.
, when volumes of
air are heated they expand and now lighter
than air rise taking away heat from the surface, and
colder volumes of
air, of the fluid gas
air around them, being heavier because
colder so more condensed will sink to the surface flowing beneath the volumes of less
dense air.
Thus, a lapse rate of -12 K / km would be extremely unstable because the
colder air would be
denser than the warm
air below it.
... similarly
dense clouds, if very high, though they equally intercept the communication of the earth with the sky, yet being, from their elevated situation,
colder than the earth, will radiate to it less heat
than they receive from it, and may, consequently, admit of bodies on its surface becoming several degrees
colder than the
air.