How much does 180 liters weigh?

A liter is a unit of volume whereas any weight is a unit of mass. To determine how much a volume of any substance weighs, the density of the substance at the current temperature needs to be found. Typically, density is expressed in g/mL. Once the density has been determined, the equation density=mass(grams)/volume(liters) is used to determine the mass or weight of the substance.