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Conversion of the Mach unit of speed depends on the altitude at which the speed is measured. That altitude should be specified either in feet (for example, |altitude_ft=10,000) or in metres (for example, |altitude_m=3,749). The altitude cannot be determined accurately and only a whole number is accepted. Examples:
By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.
The stone remains widely used in the United Kingdom and Ireland for human body weight: in those countries people may commonly be said to weigh, e.g., "11 stone 4" (11 stones and 4 pounds), rather than "72 kilograms" as in most of the other countries, or "158 pounds", the conventional way of expressing the same weight in the US and in Canada. [38]
[a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b], then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (≈277.42 cu in), the imperial gallon is 1.62% smaller than the pre-1824 ale gallon.
Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.
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Weight is measured in ounces and pounds (avoirdupois) as in the U.S. Volume is measured in imperial gallons, quarts, pints, fluid ounces, fluid drachms, and minims. The imperial gallon was originally defined as 10 pounds (4.5359 kg) of water in 1824, and refined as exactly 4.54609 litres in 1985.
In the American oil industry, a sack represents the amount of portland cement that occupies 1.15 cubic feet (8.6 US gal; 33 L), and in most cases weighs 94 pounds (43 kg). [8] Other uses in the US include the measurement by volume of salt, where one sack is 215 pounds (98 kg), cotton where one sack is 140 pounds (63.5 kg) and flour, where one ...