Cold air is more dense than warm air?

Answer 1

It's because colder air is much denser than hot air. The molecules in hot air are farther apart (expand - lighter), while the molecules in cold air are closer together (condense- heavier).

When air is heated, it expands because the gaseous particles gain kinetic energy. The formula density = mass/volume implies that the density of a substance is inversely proportional to its volume (provided that its mass is constant, which in turn means constant amount of that substance based on the number of moles). Therefore an increase in volume means a decrease in density.

Therefore, cold air has a higher density compared to hot air. This is why hot air balloons can rise up to the sky!

Any object that is heated becomes less dense and expands making a cc of it lighter, This is because the molecules that make it up become more exited and require more room as they are bumping into each other.

Answer 2

Heat excites atoms and causes them to occupy more volume in space. So there for, the hotter your air is, the thinner it is. Or, the cooler it is, the denser it is.

In simple form:

If you're freezing cold out, you want to get close together with a group of people (hopefully you know) to get warm, the molecules in a fluid are the same, if they are cold, they get close together and of course, the fluid becomes more dense, meaning it is harder for you to break through where when you are facing like a heat wave, or just hot weather and you're sweating you don't want anyone near you and with molecules, it's similar, that want to be farther apart and therefor the fluid becomes much less dense.

Answer 3

Let's consider air an ideal gas. The equation of ideal gas is

pV = NKBT,

where p is the pressure, V the volume, N the number of molecules, KB the Boltzmann constant, T the temperature. You can see that, being p kept constant, if T increases, then V increases: if V gets bigger while N remains constant, the (numeric) density of the whole gas

ρ = N/V,

decreases (and so does the mass density): higher T means smaller ρ, and viceversa.

Actually, from a microscopic point of view, one sees that T is linked to the speed of molecules, but this part is more difficult, and requires high mathematics (which I don't remember): see statistical mechanics.

Answer 4

Cold air is more dense than warm air. When molecules are heated up they start to speed up their movement, therefore not as many molecules can be contained in once space at the same pressure.

Answer 5

Yes, cold air is more dense then warm air.

Answer 6

Yes, cold air is more dense than warm air.

Answer 7

Cold air has tightly packed molecules and warm air has loosely packed molecules. That is the reason warm air generally rises and cooler air sinks down.

Answer 8

Yes,it does.

Answer 9

warm air is less dense

Answer 10

what makes the air cool with higher denstity