Physics The amount of matter in any solid object or in any volume of liquid or gas
Mass conversion rates
1 Pound = 0.45359237 Kilograms, as per the International yard and pound agreement of 1959.
1 Troy Ounce = 31.1034768 Grams, as per the International yard and pound agreement of 1959.
1 Carat = 0.2 Grams
US ton = 2000 Pounds
Imperial ton = 2240 Pounds
Put rather simply, mass is the amount of stuff something has. For that reason, it is a physical property and the SI unit is kilogram. Above all, it is important to keep the distinction between mass and weight clear. Whereas mass is a property of an object, weight is a force itself determined by the formula: W = mg , where g is the force of gravity.
The kilogram was first defined as the mass of one liter of water in 1795. However, problems arose in creating an accurate measure due to the fact that water expands and contracts depending on the temperature. Therefore, it was replaced by an exact amount of metal for many years. Until in 2019, for even greater precision, defined in terms of the speed of light, Planck constant and a specific atomic transition frequency.
The pound has had many different variations over time. Firstly, the unit of the pound, lb, comes from an abbreviation of the Roman libra, a common mass unit. Of all the previously used forms of the pound, two remain in the avoirdupois and the troy. Use of the avoirdupois is more general, whereas use of the troy system is primarily for precious metals such as gold, silver and platinum.