![]() The avoirdupois pound was implemented in the Weights and Measures Act 1963. One avoirdupois pound can be divided to 16 avoirdupois ounces and 7000 grains. There is no descriptive definition of the international avoirdupois pound. Of course, this unit is in use also in another systems. The pound is used in the British and United States customary systems of measurements. In this article we are going to to concentrate only on pound-mass. What does it mean? For example, there are also pound-force. It is needed to highlight that there are not only one kind of pound. You learned a little bit about kilogram, so now we can move on to the pound. It is also divided to 100 decagrams and 1000 grams. It is defined by taking the fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J⋅s, which is equal to kg⋅m2⋅s−1, where the metre and the second are defined in terms of c and ΔνCs.” The official definition is: “The kilogram, symbol kg, is the SI unit of mass. The new definition of the kilogram is based on physical constants, especially Planck constant. ![]() The IPK was in use until 2019, when it was replaced by a new definition. The International Prototype of the Kilogram was made of 90% platinum and 10 % iridium. Later, in 1889 the kilogram was described using the International Prototype of the Kilogram (in abbreviated form IPK). This definition was not complicated but hard to use. The kilogram was defined as the mass of one liter of water. The symbol of the kilogram is kg.įirst definition of a kilogram was formulated in 1795. It is a base unit in a metric system, known also as International System of Units (in abbreviated form SI).Īt times the kilogram could be written as kilogramme.
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