Air has mass, and gravity pulls anything with mass. The gravity of the earth "pulls" air down towards it's center.
No, it's the other way around: atmosphere needs gravity to stay on a planet. Artificially, pressurized compartments can maintain atmosphere though. Such is the case on the International Space Station.
Yes - the further away from the Earth's surface you travel - the less gravity there is to hold air molecules around the planet. Eventually, the gravitational pull is so weak, that air molecules can simply 'drift off' into space. Fortunately - enough air is held around the Earth by gravity, to sustain life !
The moon has gravity, but it is much weaker than the gravity on Earth. It is not enough to hold onto an atmosphere.
That's gravity. Near the surface air has a density of about 1.2Kg/m^3. Air isn't that lightweight as you might think. We usually just don't lift it, but push it away, which is much easier.
earth gravity is strong enough to hold down the atmosphere
Jupiter
Gravity is the force that holds a planet in orbit around the sun. Inertia keeps the planets spinning.
Earth & Venus.
The planets orbit the Sun because of the force of gravity that keeps them there. Without gravity they would all move in straight lines.
Jupiter
Jupiter has the most gravity out of all the planets
No, it's the other way around: atmosphere needs gravity to stay on a planet. Artificially, pressurized compartments can maintain atmosphere though. Such is the case on the International Space Station.
Mars' surface pressure is around 0.7 kPa, around 0.7% of Earths surface pressure. The planet has a smaller mass and lower surface gravity than Earth, so it can only hold a thin atmosphere.
The gravity of a planet does not hold it in place, nor does any planet stay still. The planets are in constant motion as they orbit the sun.
gravity and temperature; It needs gravity so it can hold its atmosphere.
the bigger the planet the more gravity it has because it needs to hold it self together so it has more gravity than smaller planets who require a small amount of gravity to hold themselves toghther
I think it is Venus or Earth.