Question

When is the density of water $1g/mL$ ? How can we measure density?

Answer 1

Density is the property of any substance that is characteristic to it. It is defined as the mass per unit volume. For liquids, the density is given by dividing the mass of the liquid taken by the volume of the liquid taken. It has the units of mass/volume

Complete Step By Step Answer:
The density of any material as described earlier is characteristic to every substance. Density is the measure of how much of the substance occupies a volume of 1 unit cube, at a fixed temperature and pressure. Specifically, it is the mass of the substance per unit volume.
Density is different for different materials, but is more commonly discussed among liquid substances. The formula for density can be given as:
$Density = \dfrac{{Mass}}{{Volume}}$
The unit of density is the same as that of mass divided by the units of volume. The common units to determine density is $g/c{m^3}$ if it’s a solid and $g/mL$ for liquids. It can also be given in terms of $g/L$ .
The density of water is found to be 1 $g/c{m^3}$ . Water was used as the basis for the establishment of the metric unit of mass, which means that a cubic centimetre of water weighs for about 1 gram. The density of water is an easy to remember value. But this density depends on both the temperature as well as the pressure of the area. The density of any substance can be determined by using the water displacement experiment. This is done by observing how much water is displaced by that subject when submerged in water. As long as the density of water is known, the mass of the object and the volume of water it displaces, you can calculate its density. This experiment was done by the Great Archimedes, to know the composition of the King’s crown.

Note:
The density of different types of water is different. The 1 $g/c{m^3}$ value is only true for pre-water. Saltwater has different density, which depends on the amount of salt dissolved in it. Its density is slightly higher than water to about 1.02 $g/c{m^3}$ .