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It is the amount of matter contained in the unit of volume of a certain substance. Its absolute value is measured in grams per cubic centimeter (gr / cm3). However, it is much more usual to indicate the relative density of a body taking as reference element the water, whose density, by convention, is set equal to 1.
Thus, for example, it is often said that lead has a density of 11.3, understanding that it is 11.3 times heavier than an equivalent volume of water; Copper has a density of 8.95 (ie 8.95 times heavier than an equal volume of water), and so on.
For celestial bodies the measurement of density is important in order to establish its constitution. In the field of the solar system, for example, Saturn has an average density of 0.69 (it could float on water), the planet being less dense. The Earth has an average density of 5.52 and is the densest planet.
The densest bodies in the Universe so far observed are the so-called collapsed objects: white dwarfs. neutron stars, pulsar, whose densities reach hundreds of thousands of times that of water.
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