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The informal public imperial measurement standards erected at the Royal Observatory, Greenwich, London, in the 19th century: 1 British yard, 2 feet, 1 foot, 6 inches, and 3 inches. The inexact monument was designed to permit rods of the correct measure to fit snugly into its pins at an ambient temperature of 62°F (16 2 ⁄ 3 °C).
According to that agreement, the international yard equals 0.9144 meters and the international pound equals 0.45359237 kilograms. [1] The international yard was about two millionths of a meter longer than the imperial yard, while the international pound was about six ten-millionths of a kilogram lighter than the imperial pound. [13]
By 1875, the average value of the guz in Bengal was 36 inches (1.0 yd; 910 mm), but was 33 inches (840 mm) in Madras and 27 inches (690 mm) in Bombay. [1] [2] By the 20th century, the guz was uniformly quoted as being equal in length to one yard in the English system, or 0.91 metres in the metric system. [3] But there are some different values ...
One momme = 4.340 g/m 2; 8 mommes is approximately 1 ounce per square yard or 35 g/m 2. The momme is based on the standard width of silk of 45 inches (1.1 m) wide (though silk is regularly produced in 55-inch (1.4 m) widths and uncommonly in larger widths). The usual range of momme weight for different weaves of silk are: Habutai—5 to 16 mm
Thickness of aluminum foil is measured in mils (1 ⁄ 1000 inch, or 0.0254 mm) in the United States. Cross-sectional area of electrical wire is measured in circular mils in the U.S. and Canada, one circular mil (cmil) being equal to 5.067 × 10 −4 mm 2 (or 7.854 × 10 −7 in 2). Since this is so small, actual wire is commonly measured in ...
A pH of 9.5 has 10 −9.5 moles hydronium ions per litre of solution (and also 10 −2.5 moles per litre OH −). A pH of 3.5 has one million times more hydronium ions per litre than a solution with pH of 9.5 (9.5 − 3.5 = 6 or 10 6) and is more acidic. [115] The effect of pH on a soil is to remove from the soil or to make available certain ions.
In both customary and imperial units, one foot comprises 12 inches, and one yard comprises three feet. Since an international agreement in 1959, the foot is defined as equal to exactly 0.3048 meters. Historically, the "foot" was a part of many local systems of units, including the Greek, Roman, Chinese, French, and English systems. It varied in ...
The pound or pound-mass is a unit of mass used in both the British imperial and United States customary systems of measurement.Various definitions have been used; the most common today is the international avoirdupois pound, which is legally defined as exactly 0.453 592 37 kilograms, and which is divided into 16 avoirdupois ounces. [1]