What do the different colour heart emojis mean? Does a red , yellow , green , blue and violet emoji all mean the same thing according to you? Solitude4
1 The relative atomic mass, or atomic weight, of an element is the weighted average of the masses of the isotopes in the naturally occurring element relative to the mass of an atom of the carbon-12 isotope which is taken to be exactly 12.
Density. Density is the mass per unit volume. This means that the density of any solid, liquid or gas can be found by dividing its mass in kilograms by its volume in cubic metres. Density can be found using the equation: 1  The unit for density is kg m -3. 2  The density of water is approximately 1000 kg m -3 and air is approximately 1.3 kg m -3.his means that the density of any solid, liquid or gas can be found by dividing its mass in kilograms by its volume in cubic metres. Density can be found using the equation: 1  The unit for density is kg m -3. 2  The density of water is approximately 1000 kg m -3 and air is approximately 1.3 kg m -3.