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Systems of measure either define mass and derive a force unit or define a base force and derive a mass unit [1] (cf. poundal, a derived unit of force in a mass-based system). A slug is defined as a mass that is accelerated by 1 ft/s 2 when a net force of one pound (lbf) is exerted on it. [2]
The former Weights and Measures office in Seven Sisters, London Units of measurement, Palazzo della Ragione, Padua. A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1]
For example, 10 miles per hour can be converted to metres per second by using a sequence of conversion factors as shown below: = . Each conversion factor is chosen based on the relationship between one of the original units and one of the desired units (or some intermediary unit), before being rearranged to create a factor that cancels out the ...
A number of units were used to measure mass in Belgium. One livre was equal to 489.5 grams (17.27 oz). Some other units are provided below: [2] [4] 1 loth = 1/32 livre 1 once = 1/16 livre 1 marc 1/2 livre 1 stein = 8 livre 1 quintal = 100 livre 1 chariot = 165 livre 1 balle = 200 livre 1 schiffpfund = 300 livre
Old units of measure; Measures from Antiquity and the Bible Antiquity and the Bible at the Wayback Machine (archived May 10, 2008) Reasonover's Land Measures A Reference to Spanish and French land measures (and their English equivalents with conversion tables) used in North America; The Unified Code for Units of Measure
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The metric system is a decimal system of measurement based on its units for length, the metre and for mass, the kilogram. It exists in several variations, with different choices of base units, though these do not affect its day-to-day use. Since the 1960s, the International System of Units (SI) is the internationally recognised metric system.
Since all gases have the same volume per mole at a given temperature and pressure far from their points of liquefaction and solidification (see Perfect gas), and air is about 1 / 5 oxygen (molecular mass 32) and 4 / 5 nitrogen (molecular mass 28), the density of any near-perfect gas relative to air can be obtained to a good ...