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Convert Kilograms and liters
kg/m³ means kilograms per cubic meter and is identical to grams per liter. g/cm³ means grams per cubic centimeter and is identical to kilograms per liter.
Example: Iron has a density of 7.874 g/cm³. A cube with an edge length of 20 centimeters has a volume of 8 liters. Made of solid iron, this cube would weigh just under 63 kilograms.
Physics commonly uses SI units. Here is a calculator to convert units.