September 26, 2020

# Some Fundamental Definitions In The Science of Chemistry – Some SI Units – Density

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Some times or most times, we forget that the world, which is all around us, is very important, and many of us, don’t try to think about our world, from other angles.

Such angle that we should be thinking about the environment around us, is chemistry, if we are able to understand our environment, at the chemical level, then our lives would be so much simpler, and better to understand.

## In today’s article we are going to continue our conversation on those, very important SI base units, which are used in chemistry

If you want to calculate the density of an object, you would divide the mass of that object, by the volume of that object.

Therefore,

`Density = mass ÷ volume.`

If you decide, that you would like to isolate the volume or the mass, then you’ll need to use density, as a conversion factor.

```As such, Mass = volume X density =
volume X mass ÷ volume```

The color code used here, is to mean that red, the volume was cancelled out, and mass was the result; after density was used as a conversion factor.

```Volume = mass X 1 ÷ density = mass X
volume ÷ mass```

On the equation above, we did the same thing, for red, which means, that the mass cancelled out, and for green which means, that volume was the result of the equation, while using density as a conversion factor.

## Density, is a characteristic property, of a substance under certain temperatures and pressures

Also even though the value of volume and mass tend to change, Density also has a specific value, for each of its subjects.

A good example of extensive properties, are of those we mentioned earlier, such as volume and mass.

Mass and volume are good examples, of extensive properties, because they are dependent, on the amount of substance, which is present on the subject.

## Intensive property, is one which is not, dependent on the amount of substance present in the subject

Such is the case of density, which is also known as intensive property and it differs from volume and mass, for this reason.

Remember though, that for this information to be true, there has to be given a particular, or ideal, conditions of temperature and pressure.

The kilogram per cubic meter (kg/m3) is the SI unit of density; however, in chemistry, the g/L (g/dm3) or g/mL (g/cm3) units, are used as the typical unit given to density.