How many grams are in 1/8 tsp if it equals 500 mg?

To determine how many grams are in 1/8 teaspoon when it equals 500 mg, it’s essential to convert milligrams to grams. The metric conversion is straightforward: 1 gram is equal to 1000 milligrams.

Given that 1/8 teaspoon equals 500 mg, we can convert this to grams by dividing 500 mg by 1000 mg/g. This calculation results in 0.5 grams.

When considering the options, it’s significant to note that the term 'gr' typically refers to grains, a unit of measure often used in pharmacology and other scientific contexts. In the conversion, we know that 1 gram is approximately 15.432 grains. Therefore, if we convert 0.5 grams to grains, we multiply it by 15.432. This gives us approximately 7.5 grains, confirming the correctness of the selected answer.

Understanding these basic conversions between different measures is crucial in medication administration to ensure accuracy in dosing.