Warm air rises because it is less dense than cold air.
Kinetic molecular theory tells us that warmer particles move faster than colder particles. (That's how we define a substance to have "heat".) You can imagine that faster particles are going to bump into each other more often, pushing other particles away.
So, yes. Warmer = less dense = rising. In all things.
No, density will be the same when cooling in a fixed container (pressure will drop, mass and volume unchanged)
Yes, density will increase in an flexible balloon (volumewill decrease, mass and presure constant)
Yes, density will be increased in cooler open air (increased mass in the same volume).
Less dense air rises because the particles are more 'excited' and move oround more causing the gas to expand.
Stable air can both rise and fall. While the air in the atmosphere may be considered stable, it can still produce moisture like rain or snow that will fall.
It resists rising.
The Arctic air is more dense, and therefore does not rise as easily.
Natural gas will usually fall toward the floor. Natural gas is heavier than air. If there are winds or breezes, it will dissipate or rise.
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The rise and fall is the tides.
Hot air rises
It resists rising.
. Unstable air, if lifted, will rise by itself without any forcing. Stable air, if lifted, will tend to sink back down.,
falls
To rise. This is global warming.
No when stable air is lifted and there is enough moisture, you can see the formation of clouds and possible showers. Thunderstorms develop when unstable air is lifted.
Hot air rises and cold air falls.
stable air tends to remain in its original position, while unstable air tends to rise.
stable air tends to remain in its original position, while unstable air tends to rise.
It sinks
Get a thermometer - the mercury will rise or fall accordingly to the temperature of the air.
The Arctic air is more dense, and therefore does not rise as easily.