Did you know that a ‘pound’ is one way to measure mass? There are 2.2046 pounds in 1 kilogram. But, why is the abbreviation for ‘pound’, lbs? When we weigh something we are referring to ‘pound-mass’ or pound by weight (compared to ‘pound-force’, which measures the amount of ‘push or pull’). The word and abbreviation for ‘pound’ comes from the Latin phrase libra pondo which means ‘a pound by weight’. The word pound comes from ‘pondo’, while the abbreviation for a pound comes from the word ‘libra’.
We hope that you lots of energy to ponder ‘weighty’ matters at school today! Remember to think kind thoughts, use kind words, and do kind things. We Love You.
The ancient Roman unit for mass was a ‘libra’. A Roman libra is equal to about 328.6 grams.
The system that uses pounds and ounces is referred to as the ‘Avoirdupois’ system.
Throughout history there have been many definitions of what a ‘pound’ was. Many were defined by the number of grains of a cereal such as wheat or barley. A Troy pound was used by jewelers; it was equal to 5,760 grains, or about 373.24 of today’s grams. A Merchant’s pound was used in trade; it was equal to 9,600 grains of wheat. A London pound was equal to 7,200 grains. Another version of the pound was the Tower pound. However it was based on the weight of a dirham, an Arabic silver penny. A Tower pound was equal to the weight of 120 silver dirhams, which is equal to about 350 grams.