The unit 'gr' is the abbreviation for which measurement?

The unit 'gr' is the abbreviation for which measurement?

• A. gr
• B. lb
• C. oz
• D. T or tbsp

Answer: (A)

Grain is a small unit of mass from the old apothecary system, and the abbreviation gr stands for grain. A grain is about 64.8 milligrams, so 1 gram equals roughly 15.432 grains. Because of its tiny size, grains were used for precise drug dosages in historical practice, though modern dosing usually uses metric units. The other measurements shown correspond to larger mass units (pounds and ounces) or a volume measure (tablespoon), none of which are abbreviated as gr.

Grain is a small unit of mass from the old apothecary system, and the abbreviation gr stands for grain. A grain is about 64.8 milligrams, so 1 gram equals roughly 15.432 grains. Because of its tiny size, grains were used for precise drug dosages in historical practice, though modern dosing usually uses metric units. The other measurements shown correspond to larger mass units (pounds and ounces) or a volume measure (tablespoon), none of which are abbreviated as gr.