Table of Contents
Volume to Mass Conversion
Converting volume to mass requires knowing the density of the substance. The relationship m = rho x V connects mass, density, and volume. This conversion is essential in chemistry for preparing solutions, in cooking for recipe scaling, and in industry for inventory and shipping calculations.
Different substances have vastly different densities. One liter of water weighs 1 kg, but one liter of mercury weighs 13.6 kg, and one liter of air weighs only 1.2 grams. Always verify you are using the correct density for your specific material and conditions.
Formula
Common Liquid Densities
| Liquid | Density (kg/m³) | 1L weighs |
|---|---|---|
| Water | 1,000 | 1.000 kg |
| Milk | 1,030 | 1.030 kg |
| Gasoline | 750 | 0.750 kg |
| Olive Oil | 920 | 0.920 kg |
| Mercury | 13,600 | 13.600 kg |
Frequently Asked Questions
Is 1 liter always 1 kg?
Only for water at approximately 4 degrees C. Other substances have different densities. One liter of honey weighs about 1.4 kg, while one liter of ethanol weighs only 0.789 kg.
What is the difference between mass and weight?
Mass measures the amount of matter (kg). Weight is the gravitational force on that mass (Newtons). On the Moon, an object has the same mass but one-sixth the weight.
How does temperature affect this conversion?
Temperature changes density. Liquids typically expand with heating, becoming less dense. For precision work, use density values at your specific temperature.