WHAT EVEN IS A GRAIN
A grain is a measurement of mass that weighs exactly 64.79891 grams. It is nominally based on a single grain of cereal. Being the foundation of traditional English weight systems, the grain is the only equal measurement of mass in the troy weight, apothecaries' weight, and avoirdupois measurement systems. It was based on a single grain of barley.
It is usually used to measure the mass of bullets and propellants. However, in archery, the grain is used as the standard unit to weight arrows. In the medicinal field, the grain is both used to measure gold foil (a material to restore teeth), and occasionally as a way to measure dosage units. This is more commonplace with older medicines, such as aspirin. For example, a standard 325 mg dosage of aspirin is sometimes given as 5 grains.
It is usually used to measure the mass of bullets and propellants. However, in archery, the grain is used as the standard unit to weight arrows. In the medicinal field, the grain is both used to measure gold foil (a material to restore teeth), and occasionally as a way to measure dosage units. This is more commonplace with older medicines, such as aspirin. For example, a standard 325 mg dosage of aspirin is sometimes given as 5 grains.