What is expressed in grams?

Answer 1

Grams are a basic SI unit for mass (sometimes considered weight), although oddly enough they are defined as 1/1000 Kilos.

Since the US still uses "standard" units of ounces, pounds, cups, and etc, the grams are not used as frequently.

The choice of a unit would depend on the accuracy and scale of a measurement.

One might choose to express anything from about 1/10 grams up to 9000 grams using the unit.

The basic conversion is 2.2 lbs = 1000 grams = 1 kg.

So...

Dosage of some medications might be expressed in grams, although more frequently in milligrams.

Net weights of food often is reported in grams as well as ounces and pounds.

In a lab, one might measure reagents in grams.

European recipes are often written in grams (mass).... which can be a pain to convert because US recipes are often written in cups (volume)

Density is often expressed in grams/cubic centimeter (cc, cm3, or ml).