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Difference Between Pounds and Kilos

Pounds vs Kilos

Since the adoption of the SI system in 1959, the world has moved over to kilogram as the unit of measurement of weight. However, there are countries like the US and UK that are still clinging to the imperial system of weights containing pounds and stone. The relation between a pound and a kilogram will be discussed in this article apart from some interesting facts.

1 kilogram is the standard unit of measurement of weight in the SI system where the weight of the International Prototype Kilogram is taken to be the mass of one liter of water. In reality, kilogram is a unit of mass and not weight as weight of a person is the product of his mass and the gravity of earth at that place. IPK is a cylindrical figure made of Iridium-Platinum and weighs exactly 1 kg. It is kept in a vault at International Bureau of Weights and Measures in France.

Pound is one of the popular units of measurement of weight in the imperial system (other two being ounce and stone). Since pound is also the unit of currency in Britain, to differentiate it from currency pound, the abbreviation of pound (weight) has been chosen as lb. This abbreviation has to do with this unit having its association with the Roman Libra. As there are many different versions of a pound used in different countries, the pound as the world knows it has been termed as International Avoirdupois Pound which is equal to 0.45359237 kilograms. As this is one conversion that is difficult to remember, one can use a simpler conversion which is a rough value of the pound.

1 lb= 450g


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  2. Difference Between Ounce and Troy Ounce
  3. Difference Between Molarity and Molality

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