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2006-10-15 01:53:57 · 12 answers · asked by Anonymous in Science & Mathematics Physics

12 answers

A metre is a unit of measurement.

1 metre=1/10 of a kilometre=100 cm= 1000 mm

1 metre= 3.280 839 895 feet=1.093 613 298 yard=0.000 621 371 mile

2006-10-15 01:56:20 · answer #1 · answered by Anonymous · 0 0

The metre, or meter (US), is a measure of length. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes. The symbol for metre is m. Historically, the metre was defined by the French Academy of Sciences as 1/10,000,000 of the distance from the equator to the north pole through Paris. Now, it is defined by the International Bureau of Weights and Measures as the distance travelled by light in absolute vacuum in 1/299,792,458 of a second. This is approximately the distance from floor to hip bone on the average barefoot man.

Decimal multiples and submultiples of the metre, such as kilometre (1000 metres) and centimetre (1/100 metre), are indicated by adding SI prefixes to metre

look yourself:http://en.wikipedia.org/wiki/Metre

2006-10-15 02:01:11 · answer #2 · answered by Anonymous · 0 0

The metre, or meter (US), is a measure of length. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes. The symbol for metre is m.

2006-10-15 01:58:17 · answer #3 · answered by Anonymous · 0 1

The meter (abbreviation, m; the British spelling is metre) is the International System of Units (SI) unit of displacement or length. One meter is the distance traveled by a ray of electromagnetic (EM) energy through a vacuum in 1/299,792,458 (3.33564095 x 10-9) of a second. The meter was originally defined as one ten-millionth (0.0000001 or 10-7) of the distance, as measured over the earth's surface in a great circle passing through Paris, France, from the geographic north pole to the equator.

One meter is a little more than three English feet, or about 39.37 inches. One foot is approximately 0.3048 meter. There are about 1609 meters in a statute mile. The official span was at one time formally defined as the separation between two scratches on a platinum bar in Paris. This was, of course, intended mainly for show, and not for use in the laboratory.

Power-of-10 prefix multipliers facilitate the derivation of other, often more convenient, distance units from the meter. One centimeter (cm) is equal to 0.01 m, one millimeter (mm) is equal to 0.001 m, and one kilometer (km) is equal to 1000 m. These units are found in nonscientific as well as scientific literature. Smaller units are the realm of the scientist and engineer. One micrometer (symbolized ?m or ?), also called a micron, is equal to 0.000001 (10-6) m. One nanometer (nm) is equal to 10-9 m. One Angström unit (symbolized Ä) is equal to 10-10 m, or 0.1 nm.

The meter and its kin are used to specify the wavelengths of EM fields. The so-called radio spectrum occupies an informally defined range of wavelengths from roughly a millimeter (microwaves) to several tens of kilometers (myriametric waves). A 3-m radio wave falls near the middle of the standard FM (frequency modulation) broadcast band; a 300-m radio wave is near the middle of the standard AM (amplitude-modulation) broadcast band. The range of visible light wavelengths is from approximately 390 nm (violet) to 770 nm (red). The speed of EM-field propagation in a vacuum, to nine significant figures, is 2.99792458 x 108 meters per second. In this sense, the meter can be derived from the second if the latter unit has been previously defined in absolute terms; one meter is the distance a ray of light travels through a vacuum in 3.33564095 x 10-9 second.

In engineering applications, and also in an everyday sense, the term meter refers to any instrument used to measure the magnitude of a quantity. Examples include the volume-unit (VU) meter in home audio systems, the ammeter to measure electric current, and the kilowatt-hour meter to measure electrical energy consumed over a period of time.

https://www.electrikals.com/

2015-08-03 17:59:15 · answer #4 · answered by shaun 4 · 0 0

Main Entry: me·tre
Pronunciation: 'mE-t&r
chiefly British variant of METER


Main Entry: 1me·ter
Pronunciation: 'mE-t&r
Function: noun
Etymology: Middle English, from Old English & Anglo-French; Old English mEter, from Latin metrum, from Greek metron measure, meter; Anglo-French metre, from Latin metrum -- more at MEASURE
1 a : systematically arranged and measured rhythm in verse: (1) : rhythm that continuously repeats a single basic pattern (2) : rhythm characterized by regular recurrence of a systematic arrangement of basic patterns in larger figures b : a measure or unit of metrical verse -- usually used in combination -- compare FOOT 4 c : a fixed metrical pattern : verse form
2 : the basic recurrent rhythmical pattern of note values, accents, and beats per measure in music

2006-10-16 12:42:49 · answer #5 · answered by Aroura 2 · 0 0

On October 21, 1983, the Seventeenth General Conference on Weights and Measures redefined the meter as follows:

"The meter is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second."

See the Wikipedia article below for the history of the meter.

Traditional units are now defined in terms of the meter:

1 inch = 0.0254 meter
1 foot = 0.3048 meter
1 yard = 0.9144 meter
1 mile = 1609.344 meters

2006-10-15 01:55:28 · answer #6 · answered by Deep Thought 5 · 0 2

me‧ter /Pronunciation[mee-ter]
Also, British, metre.

–noun 1. an instrument for measuring, esp. one that automatically measures and records the quantity of something, as of gas, water, miles, or time, when it is activated.
2. parking meter.
–verb (used with object)
3. to measure by means of a meter.
4. to process (mail) by means of a postage meter.

2006-10-15 02:04:11 · answer #7 · answered by banjo_mccain 4 · 0 0

- the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)

- the accent in a metrical foot of verse

- rhythm as given by division into parts of equal time

The word metre is from the Greek metron (μέτρον), "a measure" via the French mètre. Its first recorded usage in English meaning this unit of length is from 1797.

In the eighteenth 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, that is the distance from the equator to the north pole. In 1791, the French Academy of Sciences selected the meridional definition over the pendular definition because the force of gravity varies slightly over the surface of the Earth, which affects the period of a pendulum. In order to establish a universally accepted foundation for the definition of the metre, measurements of this meridian more accurate than those available at that time were imperative. The Bureau des Longitudes commissioned an expedition led by Delambre and Pierre Méchain, lasting from 1792 to 1799, which measured the length of the meridian between Dunkerque and Barcelona. This portion of the meridian, which also passes through Paris, was to serve as the basis for the length of the quarter meridian, connecting the North Pole with the Equator. However, in 1793, France adopted the metre based on provisional results from the expedition as its official unit of length. Although it was later determined that the first prototype metre bar was short by a fifth of a millimetre due to miscalculation of the flattening of the Earth, this length became the standard. So, the circumference of the Earth through the poles is approximately forty million metres.

In the 1870s and in light of modern precision, a series of international conferences were held to devise new metric standards. The Metre Convention (Convention du Mètre) of 1875 mandated the establishment of a permanent International Bureau of Weights and Measures (BIPM: Bureau International des Poids et Mesures) to be located in Sèvres, France. This new organisation would preserve the new prototype metre and kilogram when constructed, distribute national metric prototypes, and would maintain comparisons between them and non-metric measurement standards. This organisation created a new prototype bar in 1889 at the first General Conference on Weights and Measures (CGPM: Conférence Générale des Poids et Mesures), establishing the International Prototype Metre as the distance between two lines on a standard bar of an alloy of ninety percent platinum and ten percent iridium, measured at the melting point of ice.

In 1893, the standard metre was first measured with an interferometer by Albert A. Michelson, the inventor of the device and an advocate of using some particular wavelength of light as a standard of distance. By 1925, interferometry was in regular use at the BIPM. However, the International Prototype Metre remained the standard until 1960, when the eleventh CGPM defined the metre in the new SI system as equal to 1,650,763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum. The original international prototype of the metre is still kept at the BIPM under the conditions specified in 1889.

To further reduce uncertainty, the seventeenth CGPM in 1983 replaced the definition of the metre with its current definition, thus fixing the length of the metre in terms of time and the speed of light:

The metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.[1]
Note that this definition had the effect of fixing the speed of light in a vacuum at precisely 299,792,458 metres per second. Although the metre is now defined in terms of time-of-flight, actual laboratory realisations of the metre are still delineated by counting the required number of wavelengths of light along the distance. An intended byproduct of the 17th CGPM’s definition was that it enabled scientists to measure their lasers’ wavelengths with one-fifth the uncertainty. To further facilitate reproducibility from lab to lab, the 17th CGPM also made the iodine-stabilised Helium-Neon laser “a recommended radiation” for realising the metre.[2] Today’s best determination of the wavelength of this laser is λHeNe = 632.991 398 22 nm with an estimated relative standard uncertainty (U) of ± 2.5 × 10-11. This uncertainty is currently the limiting factor in laboratory realisations of the metre as it is several orders of magnitude poorer than that of the second (U = 1 × 10-14). Consequently, a practical realisation of the metre is usually delineated (not defined) today in labs as 1,579,800.298 728 ± 0.000 039 wavelengths of Helium-Neon laser light in a vacuum.

2006-10-15 02:04:18 · answer #8 · answered by Anonymous · 0 0

The distance travelled by light in vacuum in 1/299,792,458 of a second.

2006-10-15 02:37:45 · answer #9 · answered by Nomadd 7 · 0 0

3 foot 3 or 100 centimetres

2006-10-15 01:55:37 · answer #10 · answered by ? 4 · 0 1

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