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Does more gravity equal more dense?

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Anonymous

13y ago
Updated: 8/18/2019

Yes and No.

Surface gravity is affected by density, as your distance from the object is related to the radius of the object itself (because you're measuring it on the surface). That radius, and the mass involved are related to the strenght of gravity.

Absolute gravitational force however, is not related to density, as you are not necessarily standing on the object, but could be orbiting it.

A real life example: Earth has an average density of~5.5g/cm^3. That's 5.5x as dense as water. Saturn, has a mass 95x greater than earths, but a density of ~0.7gm/cm^3.

At any given distance from either object, Saturn's gravity is stronger. however, because Saturn is so much wider than earth, you can get closer to the center of the earth, and feel, at the surface, a higher gravity.

If you stand on the surface of the earth, you experience 1g (9.8m/s^2) of gravitational force.

If you stand on the surface of Saturn (if you could) you would feel 0.92g (~8.6m/s^2) of gravitational force.

Saturn's surface gravity is less, despite being heavier, because it's density is so much lower. The big difference, of course, is how far from Saturn's core you are.

Saturn is 60,000km across, while earth is a mere 6,000 or so.

If you were to test earth's gravity not at it's surface (where the force is 1g) but at 60,000km away, you measure a force of 0.01g...far less than saturns at that same distance (0.92g). So Saturn's absolute force, is far greater.

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Wiki User

13y ago

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