In the U.S., only the ounce, pound and short ton known in the country simply as the ton are commonly used, though the hundredweight is still used in agriculture and shipping. The grain is used to describe the mass of propellant and projectiles in small arms ammunition. It was also used to measure medicine and other very small masses.
In the U.S. only the ounce, poun.d and short ton known in the country simply as the ton are commonly used, though the hundredweight is still used in agriculture and shipping. The grain is used to descri,be the mass of propellant and projectiles in small arms ammunition. It was also used to measure medicine and other very small masses