Before calculating the number of teaspoons that are equal to 25 milligrammes of a material, one must know the substance’s density and multiply 25 milligrammes by the density in milligrammes per teaspoon. This is because teaspoons are a unit of volume and milligrammes are a unit of mass.
Since teaspoons are based on the imperial system and milligrammes are based on the metric system, certain straightforward adjustments must be made because milligrammes per teaspoon is not a recognised unit of measurement for density.
The density is 11.34 grammes per cubic centimetre, or how many teaspoons are in 25 milligrammes of lead, for instance. The density of a teaspoon is 2,300.2 milligrammes given that there are 1,000 milligrammes in a gramme and 4.93 cubic centimetres in a teaspoon. The result is about 0.1 teaspoon when the 25 milligrammes of lead are divided by the 2,300.2 milligrammes in a teaspoon.