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Topic: Unit of length

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	Foot (unit of length) - Wikipedia, the free encyclopedia
		A foot (plural: feet) is a non-SI unit of distance or length, measuring around a third of a meter.
		This unit is sometimes denoted with a prime (e.g.
		The imperial foot was adapted from an Egyptian measure by the Greeks, with a subsequent larger foot being adopted by the Romans.
	en.wikipedia.org /wiki/Foot_(unit_of_length) (410 words)

	Encyclopedia: Unit of length
		Common Imperial units and U.S. customary units of length include: Femtometre (American spelling: femtometer) is an SI measure of length that is equal to 10−15 (femto) of a metre.
		An angstrom, angstrÃ¶m, or Ã¥ngstrÃ¶m (symbol Ã…) is a unit of length.
		A cana was a unit of length used in the former Crown of Aragon.
	www.nationmaster.com /encyclopedia/Unit-of-length (1101 words)

	Old Units of Length
		Length units used in land surveying are discussed in the article "Chaining." Other units were defined for use in printing, textiles, and other areas of commerce.
		This was a bad choice for defining a unit of length, worse than simply making a couple of arbitrary scratches on a bar, since it involved a difficult and tedious procedure, especially when the news arrived in France that the earth was not a sphere to a sufficient approximation.
		Length is now defined in terms of the speed of light, assumed to be an exact value (299792458 m/s), and time by the frequency of atomic vibrations, to a rather great precision.
	www.du.edu /~jcalvert/tech/oldleng.htm (2464 words)

	Unit of length - Wikipedia, the free encyclopedia
		A unit of length is a way of measuring length or distance.
		Common units of length in the International System of Units (SI) are:
		Archaic units of distance are described in the article on Ancient weights and measures.
	en.wikipedia.org /wiki/Unit_of_length (178 words)

	Base unit definitions: Meter
		At that time, there were two competing approaches to the definition of a standard unit of length.
		Some suggested defining the meter as the length of a pendulum having a half-period of one second; others suggested defining the meter as one ten-millionth of the length of the earth's meridian along a quadrant (one fourth the circumference of the earth).
		The meter is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
	physics.nist.gov /cuu/Units/meter.html (334 words)

	[No title]
		Feet, English unit of length, defined as 0.3048 meter in U.S. Inch, English unit of length, defined as 0.00254 meter in U.S. Angstrom, unit of length, defined as 10 meter.
		Kilogram calorie, large calorie, unit of energy, is the heat required to raise the temperature of 1 kilogram of water from 1 degree centigrade at a stated temperature.
		The mean British thermal unit is defined as 1/180 of the heat required to raise the temperature of 1 pound of water from o oL 32 F to 212 F. One mean B.t.u.
	www.cs.umbc.edu /~squire/adaclass/unitconv.vu (1019 words)

	MSN Encarta - Metric System
		The measurements of modern science required still greater precision, however, and in 1983 the meter was defined as the length of the path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second.
		All units of measurement in the metric system are based on decimals—that is, units that increase or decrease by multiples of ten.
		To change units in the metric system, simply move the decimal point to the right or the left, depending on whether the unit of measurement is increasing or decreasing by ten or one hundred and so on.
	encarta.msn.com /encyclopedia_761561345/Metric_System.html (820 words)

	Length
		Length is a one-dimensional concept related to the geometric concepts of direction and line.
		Length measures need to be investigated in the many practical situations in which they occur, for example, as length, width, depth, height, thickness or closeness of objects.
		Measuring the length of objects using non-standard or informal units is the third stage in the learning sequence.
	www.nzmaths.co.nz /Measurement/Length/Length.htm (1720 words)

	length
		The Egyptians have evidence that proves that they may be the earliest civilization that discovered a standard unit for length.
		When measuring length in the customary system the common units used are inches, feet, yards, and miles.
		Units of length measure height, width, length, depth, and distance.
	www.coe.uh.edu /archive/science/science_lessons/scienceles3/length/length.html (406 words)

	Portable hand-held length probe with tracing-unit-actuated length signal output control switch - Patent 4275264
		A portable hand-held length probe with a length measuring wheel and a tracing unit which is mounted adjacent the wheel and is movable by pressing the tracing unit against a surface to be measured.
		This probe/tracer/switch arrangement 11 includes a length probe 21, a marker or tracing unit assembly 71 and a normally closed miniature self-return snap-action switch 101, such as a microswitch, actuated as a function of sliding movement of the marker/tracing unit 81 which is longitudinally slidable in housing 73.
		However, according to the present invention, the marker/tracing unit is associated with a switch 101 which controls the transmission of length signals from the wheel movement pickup to a counter 251 which indicates the length through registering pulses occurring as a function of wheel movement.
	www.freepatentsonline.com /4275264.html (1820 words)

	Measurement - Units Dictionary F-J
		However, use of the SI unit, the candela per square meter, is generally accepted.
		Because the gallon, quart, and pint differ in the United States and the United Kingdom, the use of this unit and term is generally discouraged for scientific purposes.
		This ancient unit is still commonly used to measure the height of horses from the ground to the top of the shoulder.
	www.batesville.k12.in.us /physics/ANet/Science/Measure/UnitsDictF2J.html (923 words)

	GLOSSARY
		As a unit of length, approximately 191.8 feet (180 old French 'pied', or foot).
		The (square) arpent is a unit of area, approximately.845 acres, or 36,802 square feet.
		This unit was apparently defined as one tenth of a furlong, a common unit of length in the old days.
	www.surveysinc.com /history/history_4.html (1152 words)

	Base unit definitions: Kilogram
		At the end of the 18th century, a kilogram was the mass of a cubic decimeter of water.
		In 1889, the 1st CGPM sanctioned the international prototype of the kilogram, made of platinum-iridium, and declared: This prototype shall henceforth be considered to be the unit of mass.
		The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.
	physics.nist.gov /cuu/Units/kilogram.html (117 words)

	The Earth based units of length and the birth of the metric system
		Nevertheless, at the beginning of spring of the following year a different unit of length was chosen by the French Academy of Sciences, thus signing the end of the seconds pendulum as length standard and causing a setback of the international cooperation on units of measurements.
		Chronology of units of length based on nature: from the seconds pendulum to (a fraction of) the light second.
		Indeed, Earth related units had had also quite a long history, though they were not as popular as the seconds pendulum, probably because their intrinsic difficulty to be determined.
	www.roma1.infn.it /~dagos/history/sm/node4.html (1339 words)

	Foot (unit of length)
		A foot is a unit of length, the original measure being the length of a man's foot.
		The most commonly used foot today is the imperial unit, the foot currently defined to be 0.3048 meters.
		The foot as a measure was used in almost all cultures.
	www.ebroadcast.com.au /lookup/encyclopedia/fo/Foot_(unit_of_length).html (157 words)

	Method and device for recording a mark having a substantially constant number of pulses per unit length independent of ...
		Small variations in the number of pulses per unit of length of a mark are possible in embodiments where a disc-shaped carrier rotating at constant angular velocity is divided is several zones, each of which is written at a constant angular density and zones at increasing radii are written at increasing angular density.
		When recording the data signal, a `high` period is recorded as a mark having a length corresponding to the duration or width of the `high` period, and a `low` period is recorded as an unwritten area between marks and having a length corresponding to the duration or width of the `low` period.
		The control unit may generate the pulses of equal width by means of a mono-stable multivibrator triggered by the data signal and the clock signal.
	www.freepatentsonline.com /5802032.html (5485 words)

	CSS2 syntax and basic data types
		'em' unit is equal to the computed value of the 'font-size' property of the element on which it is used.
		Pixel units are relative to the resolution of the viewing device, i.e., most often a computer display.
		Absolute length units are only useful when the physical properties of the output medium are known.
	www.w3.org /TR/REC-CSS2/syndata.html (4673 words)

	The Unit Circle
		The circle's center is at the origin, and its circumference comprises the set of all points that are exactly one unit from the origin while lying in the plane.
		To use the unit circle, we put the vertex of an angle at the center of the circle with the first side of the angle extending along the x-axis from the vertex toward the right.
		The circle's radius being one unit in length is important now, because the sine and cosine are defined as the opposite or adjacent (respectively) over the hypotenuse.
	www.humboldt.edu /~dlj1/PreCalculus/Images/UnitCircle.html (660 words)

	hair length
		The units for rate of growth are mm/day.
		If the time unit is in months then multiply the number of months by 30.5.
		If the time unit is in years then multiply the number of years by 365.
	www.shodor.org /succeedhi/succeedhi/hair/math1-content.html (394 words)

	Length—Evolution from Measurement Standard to a Fundamental Constant
		The meter (m) is the Si unit of length and is defined as the length of the path traveled by light in vacuum during the time interval of 1/299 792 458 of a second.
		The length standard was disseminated to the national laboratories through the use of artifact meters, which were accurate (but not identical) replicas of the prototype meter.
		The ability to transfer the length standard to practical measurements is influenced by the index of refraction (n) of the beam path of the measuring instrument since the wavelength of the HeNe laser (633 nm) is air is smaller than its vacuum wavelength by 2.7 parts in 10
	www.mel.nist.gov /div821/museum/length.htm (1598 words)

	Metric units and Measurement
		The standard unit of length in the metric system is the meter.
		Other units of length and their equivalents in meters are as follows:
		The standard unit of mass in the metric system is the gram.
	www.mathleague.com /help/metric/metric.htm (457 words)

	Length
		Meters and their derived units, such as kilometers, centimeters, and millimeters, all measure the property that we call length.
		The appropriate metric unit for distances between cities is a kilometer (km).
		Thus a kilometer is 1,000 times the length of one meter.
	dl.clackamas.cc.or.us /ch104-01b/length.htm (242 words)

	E.B. Holmber & Associates
		Acre - The (English) acre is a unit of area equal to 43,560 square feet, or 10 square chains, or 160 square poles.
		Its name derives from "furrow long", the length of a furrow that oxen can plow before they are rested and turned.
		As a unit of area, equal to a square with sides one pole long.
	www.ebholmberg.com /glossery.html (1553 words)

	Hand (unit of length) (Site not responding. Last check: 2007-10-08)
		A hand is a unit of measurement, used for the height of horses in the US and the UK: in this context, one hand equals four inches (10.
		A hand is a unit of measurement, used for the height of horses in the US and the UK: in this context, one hand equals four inches (10.2 cm).
		To this answer the envoys made no reply, but asked that point, and quietly talk the matter over and try to come to some from the first that they had no right intentions, and that it was wanting to confer in secret with a committee of two or three.
	www.termsdefined.net /ha/hand-(unit-of-length).html (307 words)

	The Universe on its Terms
		After all, a material unit length, like a meter, is based on matter.
		In the universe, however, if we look for a "true" reference unit length, we find that there are an infinite number of choices.
		Although it is a reference length we have not yet assigned it a numerical identity (...and may not want to!).
	www.martinelli.org /rexpansion/realvsab.htm (2564 words)

	CSS Length Units Reference (Internet Explorer - DHTML) (Site not responding. Last check: 2007-10-08)
		A relative length unit specifies a length in relation to another length property.
		Relative length units scale better from one output device to another, such as from a monitor to a printer.
		Absolute length units are useful when the physical properties of the output device are known.
	msdn.microsoft.com /workshop/author/css/reference/lengthunits.asp (223 words)

	meter – (symbol: m) the SI fundamental unit of length, equivalent to 39 (Site not responding. Last check: 2007-10-08)
		meter – (symbol: m) the SI fundamental unit of length, equivalent to 39
		meter – (symbol: m) the SI fundamental unit of length, equivalent to 39.37 inches, in the metric system.
		) of the earth's quadrant passing through Paris but was redefined in 1960 as the length equal to 1650763.73 wavelengths in a vacuum of the orange-red radiation of krypton-86.
	www.yphysics.freenet.kz /Words%20M/meter.htm (69 words)

	Syntax and basic data types
		in this specification) is a (with or without a decimal point) immediately followed by a unit identifier (e.g., px, em, etc.).
		If a negative length value is set on a property that does not allow negative length values, the declaration is ignored.
		It is recommended that the reference pixel be the visual angle of one pixel on a device with a pixel density of 96dpi and a distance from the reader of an arm's length.
	www.w3.org /TR/CSS21/syndata.html (5849 words)

	astronomical unit concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-08)
		Next length unit: Bohr radius Up: length unit, non SI unit Previous length unit: angstrom
		Mercury, the innermost planet, lies on average 0.39 AU from the Sun; Pluto, normally the farthest planet, lies on average 39.5 AU from the Sun.
		The astronomical unit is defined as the length of the radius of the unperturbed circular orbit of a body of negligible mass moving around the Sun with a sidereal angular velocity of 0.017202098950 radian per day of 86400 ephemeris seconds.
	www.csi.uottawa.ca:4321 /astronomy/astronomicalunit.html (219 words)

	The Derivative, Unit Tangent Vector, and Arc Length
		The unit tangent vector, denoted T(t), is the derivative vector divided by its length:
		The arc length function s(t) measures the length of the curve from a to t.
		Here is the significance of parameterization with respect to arc length: s=0 corresponds to the initial point on the helix; r(s=1) corresponds to the point one unit of length along the curve from the initial point; and, in general r(s=s_1) is the point s_1 units of length along the curve from the initial point.
	www.math.oregonstate.edu /home/programs/undergrad/CalculusQuestStudyGuides/vcalc/arc/arc.html (476 words)

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