The metre (Commonwealth English) or meter (American English) (symbol: m) is the SI base unit of length. It is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 of a second. Adding SI prefixes to metre creates multiples and submultiples; for example kilometre (1000 metres; kilo- = 1000) and millimetre (one thousandth of a metre; milli- = 1 / 1 000). Metre - SI prefixes applied to the metre. The metr ...

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Metre - SI prefixes applied to the metre Metre - Conversions Metre - History
Metre - Timeline of definition

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Cubic metre - History Cubic metre - Conversions Cubic metre - Multiples and submultiples Cubic metre - External link

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The word metre is from the Greek metron (μετρον), "a measure" via the French mètre. Its first recorded usage in English is from 1797. In the 18th century, there were two favoured approaches to the definition of the standard unit of length. One suggested defining the metre as the length of a pendulum with a half-period of one second. The other suggested defining the metre as one ten-millionth of the length of the earth's meridian along a quadrant (one-fourth the polar circumference of the earth). In 1791, th ...

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Metre, Metre - SI prefixes applied to the metre, Metre - Conversions, Metre - History, Metre - Timeline of definition

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The 2.4mR is a one-person keelboat. It is a miniaturized version of the old America's Cup boats on a 1:5 scale. 2.4mR has been a Paralympic class since 2000 and is ideal for handicap integrated sailing since the sailor does not move in the boat, and everything is adjustable from right in front of the sailor. Both hand-steering and foot-steering is possible. The boat's ability in integrated sailing has been proven on the result lists of several World Championships. In 2002 there was a handicapped World Champion. The boat is sailed without a spinnaker, but ...

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The International 5.5 Metre Class was conceived as a type of racing keel boat which gave a similar sailing experience to the International 6 Metre Class but at a lower cost. Each 5.5 metre boat is unique because considerable variation is allowed by use of a design formula. The various design parameters of a new boat (eg, length, weight, sail area etc etc) are input into the 5.5 metre formula and the result must be 5.5 metres. If the result is not 5.5 then a parameter or combination of parameters must be adjusted to achieve a re ...

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The 12-metre class is a group of sailing vessels which, while not identical, are all designed to a particular formula, so as to make the boats involved in a competition roughly comparable, while still giving individuals the freedom to experiment with the details of their designs. They are best known for their use as the vessels used for many years to compete for the America's Cup. Rough equality between boats is ensured by requiring compliance with a formula that takes into account the length at the waterline, the girth (the me ...

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12-metre class - America's Cup

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1 km² is equal to: the area of a square measuring 1 kilometre on each side 1,000,000 m² 100 hectares 0.386 102 square miles (statute) 247.105 381 acres Conversely: 1 m² = 0.000 001 km² 1 hectare = 0.01 km² 1 square mile = 2.589 988 km² 1 acre = 0.004 047 km² Note: "km²" means square kilometre and not kilo–square metre. For example, 3 km� ...

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Square metre, Square metre - Square kilometre, Square metre - Square megametre

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There are four different time signatures in common use: simple duple (ex. 4/4) simple triple (ex. 3/4) compound duple (ex. 6/8) compound triple (ex. 9/8). If each beat in a measure is divided into two parts, it is simple metre, and if divided into three it is compound. If each measure is divided into two beats, it is duple metre, and if three it is triple. Some people also label quadruple, while some consider it as two duples. The latter is more consistent with the above labelling system, ...

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Metre music, Metre music - Rhythmic metre, Metre music - Polymetre, Metre music - Metric structure, Metre music - Metre in song, Metre music - Sources

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To help compare different orders of magnitude this page lists lengths between one metre and ten metres. Distances shorter than 1 m See also. Orders of magnitude (length) Category: Orders of magnitude (length) ...

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To help compare different orders of magnitude this page lists lengths between 10-3 m and 10-2 m (1 mm and 1 cm). Distances shorter than 1 mm 1.0 mm is equal to 1/1000th of a metre 0.039 inches side of square of area 1 mm2 edge of cube of volume 1 mm3 2.54 mm — distance between pins on old DIP (dual-inline-package) electronic components 5 mm — length of average red ant 7.62 mm — common military ammunition s ...

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To help compare different orders of magnitudes this page lists lengths between 10-9 m (metre) and 10-8 m (1 nm and 10 nm). Lengths shorter than 1 nm 1 nm = 1 nanometre = 1000 picometres = 10 Ångströms is roughly the length of a sucrose molecule, calculated by Albert Einstein. 1.1 nm — diameter of a single-walled carbon nanotube 2 nm — diameter of DNA helix 3 nm — flying height of the head of a hard ...

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A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a metre. There are twelve inches in one foot and three feet in one yard. The international standard symbol for feet is ft (see ISO 31-1, Annex A). The standardization of weights and measures has left several different standard foot measures. The most commonly used foot today is the English foot, used in the United Kingdom and the United States and elsewhere, which is defined to be exactly 0.3048 metre. This unit is sometimes ...

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Foot unit of length - Etymology Foot unit of length - External link

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A unit of length is a way of measuring length or distance. Common units of length in the International System of Units (SI) are: metre (or "meter" in US English) and its multiples, such as "centimetre" or "kilometre" Non-SI units of length include: fermi (fm) (= 1 femtometre in SI units) angstrom (Å) (= 100 picometres in SI units) micron (= 1 micrometre in SI units) Common Imperial units and U.S. customary units of length include: inch (25.4 mm) foot (0.3048 m) yard (0.91 ...

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Area is a physical quantity expressing the size of a part of a surface. Surface area is the summation of the areas of the exposed sides of an object. Area - Units. Units for measuring surface area include: square metre = SI derived unit are = 100 square metres hectare = 10,000 square metres square kilometre = 1,000,000 square metres square megametre = 1012 square metres Imperial units, as currently defined from the metr ...

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Area - Units Area - Useful formulas

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Anaconda Smelter Stack is the 178.3 metre tall chimney of Anaconda Smelter at Anaconda, Montana in the United States. Anaconda Smelter Stack was built in 1919 and is one of world's tallest structures built of bricks. Other related archivesAnaconda, Montana, bricks

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1 cubic metre is equivalent to: 1,000 litres (exactly) ~35.3 cubic feet (approximately). 1 cubic foot is 0.028 316 846 592 m³ (exactly) ~1.31 cubic yards (approximately). 1 cubic yard is 0.764 554 857 984 m³ (exactly) ~6.29 oil barrels (approximately). 1 barrel is 0.158 987 294 928 m³ (exactly) A cubic metre of pure water at a temperature of 3.98 °C (degrees Celsius) and standard atmospheric pressure h ...

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Cubic metre, Cubic metre - History, Cubic metre - Conversions, Cubic metre - Multiples and submultiples, Cubic metre - External link

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Yachting is a noncommercial boating activity. It may be racing sailing boats, cruising to distant shores, or day-sailing along a coast. Yachting - Racing - yachting as a sport. Whilst sailing's invention is prehistoric, racing sailing boats is believed to have started in the Netherlands some time in the 17th century, whence it soon made its way to England where custom-built racing "yachts" began to emerge. In 1851, a challenge to an American yacht racing club in New York led to the beginning of the ...

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Yachting - Racing - yachting as a sport Yachting - Cruising - yachting as a lifestyle

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Square megametres are not widely used; however, there are a number of "megametre fans" who think that this unit is very convenient for measuring oceans and continents. 1 Mm² is equal to: the area of a square measuring 1 megametre on each side 1,000,000,000,000 m² 100,000,000 hectares 1,000,000 km² ...

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Square metre, Square metre - Square kilometre, Square metre - Square megametre

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Density in terms of the SI base units is expressed in terms of kilograms per cubic metre (kg/m³). Other units fully within the SI include grams per cubic centimetre (g/cm³) and megagrams per cubic metre (Mg/m³). Since both the litre and the tonne or metric ton are also acceptable for use with the SI, a wide variety of units such as kilograms per litre (kg/L) are also used. Imperial units or U.S. customary units, the units of density include pounds per cubic foot (lb/ft³), pounds per cubic yard (lb/yd³), pounds per cubic inch (lb/ ...

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Density, Density - Other units, Density - Measurement of density, Density - Density of substances

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Excavated in October 1980, the burial chamber is underground. The 105-metre-high chamber is rectangular: 50 × 26-m, and is covered with blue-green bricks. It contains a 1.05-metre tall, 0.58 × 0.26-m mugui-shaped (土圭) granite epitaph, on which 728 Chinese characters, in the Regular Script style, are inscribed in 18 horizontal lines. Mausoleum of Princess Zhenxiao - Mural. The chamber is surrounded by four murals on each wall, depicting thirteen person in action, such as warriors (3), chamber a ...

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Mausoleum of Princess Zhenxiao, Mausoleum of Princess Zhenxiao - Burial chamber, Mausoleum of Princess Zhenxiao - Mural, Mausoleum of Princess Zhenxiao - The princess and companions, Mausoleum of Princess Zhenxiao - Other structures

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