- A convenient method of measuring ingredients by volume, reasonably accurate in the case of liquids but less so for solids. Volumes are measured in millilitres (ml) and litres (l) in the metric system used in most countries and in fluid ounces (fl oz), pints (pt) and gallons (gal) in the old imperial system taken over with different sizes in the USA. Other measures of volume are in use, e.g. cup measure, can measure and market measure. The disadvantages of volume measure are the variation in density (weight per unit volume) of any solid commodity with particle size and moisture content and the inaccuracy of dispensing from common measuring jugs, etc. Volume measures also include the standard teaspoon, dessertspoon and tablespoon.