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By definition, density is mass divided by volume. Its a measure of total space taken up by a mass (any physical quantity). As an example to show why density is a important physical quantity, a kilogram each of Iron and cotton would weigh (mass) same, but a KG of iron occupies very little space (Volume) as compared to a KG of cotton. This is where density plays a major role.
the mass
Perhaps you are thinking of "KILO" for the letter ' K ', even though the word is actually the prefix meaning "thousand", and a kilogram is a mass, not a weight.
It means something's home is in the forest. For example, a camel's habitat is the desert.
It depends on circumstances. For example if you want something really badly use it now.