I am assuming that you mean mass of an object. The answer is no, it does not change. Mass (Density) stays the same wherever the object is, only its weight will change if the force of gravity is different.
The density of air decreases as altitude increases.
Altitude has a large affect on the air pressure and air density. Air density reduces with altitude and air pressure reduces with altitude as well.
At standard temperature.
Air density decreases with altitude, warmer temp and moisture
-- If the object floats in water, then its density is less than the density of water. -- If the object sinks in water, then its density is more than the density of water. -- If the object floats in air, then its density is less than the density of air. -- If the object sinks in air, then its density is less than the density of air.
The density of air decreases when the altitude rises.
density changes as the altitude changes.
1 I'm not sure that this is true-- at least without some qualifications. If an object's shape is changed in such a way that it will enclose one or more pockets of air, some other substance, or even vacuum, the object's over-all density may change. If no pockets are formed, then the density probably is not changed 2 Density is the ratio of mass to volume.
Heat or cool the object and this will cause a density change.
The density of air decreases as altitude increases.
No
To change density there are three ways. You can change the shape, mass or volume of the object
In a simple way, since density = mass /volume, the density of an object can be changed by changing either mass or volume of an object .
Yes.
The density of the atmosphere decreases with altitude.
Change the temperature.
density