- #1
pauldunnnnnnnn
- 1
- 0
Gravity seems emense in strength of objects with large mass. So how does the Earth hold on to air molecules
Are you asking because you don’t know the answer or because you know the answer and you’re seeing if we know?BvU said:Just for the fun of it: what is the mass of a cubic kilometer of air (normal T and p ) ? One metric tonne, a thousand, or a million ?
That's clever! So the other 20% of elements that air is composed of does not make much of a difference?BvU said:Ait is mostly nitrogen. Mass of 22.4 liter N2 is 28 gram (standard T p). Let's round off to 22.4 so 1 liter is 1 gram. Now all we have to do is scale up from 1 L (1 dm3) to 1 km3.
Gravity is a force that exists between any two objects with mass. The strength of the force depends on the mass of the objects and the distance between them.
Gravity holds onto the atmosphere by exerting a force on the particles of gas that make up the atmosphere. This force keeps the particles from escaping into space.
The atmosphere does have some particles that are able to escape into space, but the majority of the particles are held in place by the force of gravity. This force is strong enough to keep the atmosphere from escaping.
The atmosphere does not affect the force of gravity, but it does alter the behavior of objects falling through it. The atmosphere creates drag, which slows down objects and can change their trajectory.
Gravity can hold onto most gases in the atmosphere, but it is less effective at holding onto lighter gases such as hydrogen and helium. These gases are more likely to escape into space due to their lower mass. However, Earth's gravity is strong enough to hold onto the majority of the gases in our atmosphere.