If you want to determine the density of an object, you would measure the mass and volume, then divide mass/volume to determine density. This can help determine the composition of the object. For example, if you find a rock that looks like a gold nugget. The density of gold is a known value, so one of the tests in determining if you are holding real gold would be to determine the density of your rock.
This is one example. Another (maybe more 'real world' for you). Shipping and cargo companies measure the volume of packages as they go by on the conveyor belt, so that they can figure how many will fit in a particular truck.
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You can't. Volume is the space occupied by a substance or object. To find the volume from the mass, the density would have to be known. Density = Mass / Volume If you want to find any of the three, you need the other two.
water displacement
To find the mass and volume of an object, you need to use a measuring device. For example, you can use a balance to measure the mass of the object and a graduated cylinder to measure its volume. Once you have these measurements, you can record the mass as 50 grams and the volume as 5 milliliters.
If you want to find a volume of a regular shape, You need to multiply Length, Width, and High.
If you want to measure it's volume, place it in a measuring cylinder containing a certain amount of water, and measure the extra units to get the volume of the object