It stops things floating off the floor.
It does have gravity, but it's gravity isn't as strong as our home plant, Earth.
Gravity is not "used". In gymnastics, gymnasts almost defy-gravity by flipping in the air but have no control of what gravity does.
"Relative gravity" is used more or less as a synonym for density; it bears no direct relation with "gravity" as such. So, you would have to specify, "specific gravity [or density] of what substance"."Relative gravity" is used more or less as a synonym for density; it bears no direct relation with "gravity" as such. So, you would have to specify, "specific gravity [or density] of what substance"."Relative gravity" is used more or less as a synonym for density; it bears no direct relation with "gravity" as such. So, you would have to specify, "specific gravity [or density] of what substance"."Relative gravity" is used more or less as a synonym for density; it bears no direct relation with "gravity" as such. So, you would have to specify, "specific gravity [or density] of what substance".
nothing
A refractometer is often used to test the specific gravity of a cell.
Gravity acts against aeroplanes and forward speed and lift are used to conquer gravity.
Your question is ambiguous. Are you asking why gravity exists or is gravity or more to the point can Gravity/Magnetism be used as an energy source.
Gravity causes the less dense stuff to rise
Newtons
Earth has gravity rather than other planets.
gravity would be used in a sentence like this: The gravity of the Earth is a very important part of life.
The common term used to describe the force of gravity on an object is its weight. Weight is the measure of the force of gravity acting on an object due to its mass.