How to Convert Between Units of Mass and Weight
The International Avoirdupois Pound (abbreviated lb) is the world’s most iconic unit of mass and weight. Defined as exactly 0.45359237 kilograms, a pound is used in all major commercial and scientific institutions around the world.
The kilogram (abbreviated kg) is the base unit of mass in the metric system and corresponds to international standard units used by countries like the United States that use this same system. This makes the kilogram a highly useful measurement unit; it can be used for nearly any kind of mass or weight, including gases, liquids, solids – even human body mass!
The pound (abbreviated lb or pound-weight) is one of the oldest units of mass measurement and its cousin to the kilogram. It’s a useful unit due to its ease of conversion between different units.
The milligram (abbreviated mg) is the smallest unit of weight or mass in the metric system and widely used throughout North America. Additionally, it serves as the base unit of measurement in Britain and Australia and forms part of the British imperial measurement system.
The most fundamental characteristic of the osm is its weight measurement unit – grams or kilograms. As such, it serves to represent how much mass there is per unit weight.