gmL

gmL is an informal notation that some readers encounter to denote grams per milliliter, a unit used to express density or concentration. The standard and widely recommended form is g/mL (or g mL−1). Because gmL is not uniformly standardized, its meaning should be inferred from context, and when precision is important, g/mL should be used.

In practical terms, 1 g/mL means one gram of a substance present per one milliliter of volume. This is equivalent to 1 g per cm^3, since 1 mL equals 1 cm^3, and to a density of 1000 kg/m^3. The unit expresses mass per volume, so for liquids it closely corresponds to density at a given temperature, while for solutions it can describe how much solute mass is present per unit volume of solution or solvent.

Usage contexts vary: g/mL is common in chemistry and biology for labeling liquid densities and concentrated solutions. Water at room temperature has a density close to 1.0 g/mL, ethanol about 0.789 g/mL, and glycerol about 1.26 g/mL. In practice, mass per volume is often reported as g/mL or converted to other SI-friendly units such as kg/m^3, depending on the measurement and field. While gmL may appear in some informal notes or labels, adherence to g/mL helps avoid ambiguity in scientific communication.