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Topic: Watt per meter kelvin

	derived units
		The kilogram per meter is the linear density of a homogeneous body of uniform section having a mass of 1 kilogram and a length of 1 metre.
		The watt per meter kelvin is the thermal conductivity of a homogeneous body in which a difference of temperature of 1 Kelvin produces a heat flow rate of 1 watt between two parallel planes having a surface of 1 square meter which are 1 meter apart.
		The ampere per meter is the strength of the magnetic field produced in vacuum along the circumference of a circle of 1 meter circumference, by an electric current of 1 ampere, maintained in a straight conductor of infinite length of negligible circular cross section, forming the axis of the circle mentioned.
	www.slmetrology.org /derivedunits.htm (2205 words)

	Lighting in Your Aquarium: Spectrum and Intensity
		Kelvin is a scale that has been developed to describe the color of light.
		In the natural environment, as light enters the water and passes through the first 15 feet of water, the red and orange wavelengths are absorbed by the water, increasing the K rating of the light, and giving the light a bluer appearance.
		One lux is equal to 1.46 milliwatts (0.00146 watts) of energy of one specific frequency (555 nm) hitting a surface area of one square meter.
	www.peteducation.com /article.cfm?cls=16&cat=1789&articleid=2689 (2114 words)

	Current definitions of the SI units
		The meter is the length of the path travelled by light in vacuum during a time interval of
		The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
		The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency
	physics.nist.gov /cuu/Units/current.html (231 words)

	OFFICIAL GAZETTE
		The tesla is the magnetic flux density in a surface of one square meter caused by a uniform magnetic flux of 1 weber perpendicular to that surface.
		Watt per square meter steradian is the radiance in a given direction at a point above a surface a unit area of which has a radiant intensity of 1 watt per steradian and the area of the projection of such unit area on the surface perpendicular to such direction is 1 square meter.
		Watt per square meter is the acoustic intensity in a plane sound wave when it transmits an acoustic energy of 1 joule across a surface of 1 square meter in a second.
	www.dncustoms.gov.vn /web_Eglish/english/nghi_dinh/ND_65_2001_ND-CP.htm (3445 words)

	Highbeam Encyclopedia - Search Results for kelvin
		Kelvin Simmons is the first African American to direct the Missouri Department of Economic Development.(On The Move)(Brief Article)
		Interview - Kelvin MacKenzie: Rottweiler who's lost his bark.
		Freedom to focus: director Kelvin Tong is elated to have been given free reins to direct his latest feature.
	www.encyclopedia.com /SearchResults.aspx?Q=kelvin&StartAt=21 (1561 words)

	Thermal conductivity - Biocrawler
		In the SI system of units, thermal conductivity is measured in watts per metre-kelvin, W·m
		The reciprocal of thermal conductivity is thermal resistivity, measured in kelvin-metres per watt (K·m·W
		When dealing with a known amount of material, its thermal conductance and the reciprocal property, thermal resistance, can be described.
	www.biocrawler.com /encyclopedia/Watt_per_meter-kelvin (665 words)

	Measurement
		In 1799 the meter was originally defined as one ten millionth of the quadrant of the earth.
		The meter (m) is the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second.
		It shows the relationship between volume expressed in cubic meters, and the equivalent volume in liters, and the mass of water, at maximum density which is about 4 degrees centigrade, that will fill that volume.
	home.att.net /~NCSDCA/SCIENCE/measure.htm (1948 words)

	metre.info - Encyclopaedia of all base measures
		Setting the length of the new meter in old units was not done for a love of the old units, but because the meridian standard was impractical as a legal standard and to have an interim measure before a final standard for the meter could be created.
		Obviously, the definition of the meter as 1/10 000 000 of the distance North Pole-Equator also meant that the meter would not be exactly 1/40 000 000 of the earth’s circumference as the other three quarters of this circumference might have different lengths.
		The meter is also the basis for measures of area (square meters), measures of volume (cubic meter) and forms part of many other combined measures (such as speed which is measured in metres per second or kilometres per hour).
	web8.ehost-services.com /cdkaese/metre/baseunits.htm (7244 words)

	Units: K
		Similarly, one kilogram force per square meter is equal to 9.806 65 pascals.
		1 km/h is equal to 5/18 meter per second, 0.621 371 19 miles per hour or 0.911 344 42 feet per second.
		Since the watt is 1 joule/sec and there are 3600 seconds in an hour, the kilowatt hour is equivalent to exactly 3.6 megajoules of energy, or about 3412.141 Btu, 859.846 (kilogram) Calories, or about 2.655 million foot pounds.
	www.unc.edu /%7Erowlett/units/dictK.html (3827 words)

	Inventors and Inventions of Scientific Instruments: EnchantedLearning.com
		In 1983, the meter was redefined as 1/299,792,458 of the distance that light travels in one second in a vacuum.
		Watt produced this rotary-motion steam engine in 1781; it was used for many applications, including draining mines, powering looms in textile factories, powering bellows, paper mills, etc. It helped power the Industrial Revolution.
		Watt coined the term "horsepower," which he used to convey the power of his engines; Watt calculated how many horses it would take to do the work of each engine.
	www.enchantedlearning.com /inventors/science.shtml (5684 words)

	Aquarium Lighting; Kelvin, Nanometers, PAR, Bulb, CRI, Watt, light basics.
		The 2-3 watts per gallon for a Nano reef or freshwater plant aquarium, less for fish, more for hard coral; is a start but that is very general.
		Kelvin is used to define the heat or energy output of a bulb and if this is applied to two 36 watt PC bulbs, one 6500K the other 10,000K (often daylight or power glow), the 10,000K bulb has a higher energy output.
		Kelvin temperatures less than 5500 become more red and yellow and the higher the Kelvin temperature the more blue the light is. Most photosynthetic invertebrates should be kept with lamps of a 20000K rating.
	www.americanaquariumproducts.com /Aquarium_Lighting.html (3653 words)

	SI Units
		The unit of measurement for every physical quantity is derived from, and described in terms of, one or more base units.
		Larger or smaller multiples of these units of more convenient size are obtained by combining the unit with an appropriate prefix selected from a specific series.
		meter of a flbody at the temperature of
	whitewolf.newcastle.edu.au /techinfo/units_si.html (780 words)

	Measurement - Units Dictionary U-Z
		The apparent power at the port of entry of a single-phase two-wire circuit when the product (a) the rms (root mean square) value of the current (in amperes) and (b) the rms value of the voltage (in volts) is equal to 1.
		The magnetic flux passing through an area of 1 square meter placed normal to a uniform magnetic field of magnetic flux density equal to 1 tesla.
		If the flux linked by a circuit changes at a uniform rate of 1 weber per second, a voltage of 1 volt is induced i the circuit.
	www.batesville.k12.in.us /physics/ANet/Science/Measure/UnitsDictU2Z.html (471 words)

	Aquarium Lighting: Spectrum and Intensity - Part 1
		The spectrum or "temperature" of light is measured in degrees Kelvin (K).
		The Kelvin scale describes the color of a light source when compared to a theoretical "flbody." Think of a piece of steel that changes color as it is heated.
		A candle flame on the Kelvin scale has a rating of 1800 K. Sunlight at noon, with a Kelvin rating of 5500 K, is typically referred to as full spectrum because it contains a blend of all colors throughout the spectrum.
	www.liveaquaria.com /general/general.cfm?general_pagesid=149 (891 words)

	[No title]
		The candela is the luminous intensity, in the perpendicular direction, of a surface of 1/600,000 square meter of a flbody at the temperature of freezing platinum under a pressure of 101,325 newtons per square meter.
		The steradian is the solid angle which, having its vertex in the center of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.
		The watt is the power which gives rise to the production of energy at the rate of 1 joule per second.
	www.textfiles.com /science/stndrds (1249 words)

	International System
		Like the international prototype meter (which was constructed at the same time) access to the international prototype kilogram is strictly controlled to reduce wear and tear on it from normal use and to prevent its accidental or intentional destruction.
		The meter is the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second.
		The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
	www.hypertextbook.com /physics/foundations/system-international (2756 words)

	[No title]
		Pounds per cubic foot is a measure of density, which aquarists are most likely to encounter in relation to the bulk density of solids such as calcium hydroxide, calcium oxide or calcium carbonate powders. A calculator for various density-related units can be found here.
		Originally, the meter was designed to be one ten-millionth of the distance between the Equator and the North Pole. Over the years it has become better defined, and is now defined in terms of the speed of light and the specific fraction of the length that light travels in a second in vacuum.
		Milligram per L is a unit of concentration often used for chemicals in aquaria. For chemical concentrations in freshwater, 1 mg/L is approximately 1 ppm (= 1 mg/kg). For chemical concentrations in seawater, where 1 L weighs approximately 1.023 kg, 1 mg/L is approximately 0.978 ppm (= 0.978 mg/kg).
	reefkeeping.com /issues/2005-08/rhf/index.php (8682 words)

	NIST Guide to SI Units - 4 The Three Classes of SI Units and the SI Prefixes
		Table 1 gives the seven base quantities, assumed to be mutually independent, on which the SI is founded; and the names and symbols of their respective units, called "SI base units." Definitions of the SI base units are given in Appendix A.
		The kelvin and its symbol K are also used to express the value of a temperature interval or a temperature difference (see Sec.
		For example, the joule per kelvin (J/K) is the SI unit for heat capacity as well as for entropy.
	physics.nist.gov /Pubs/SP811/sec04.html (1308 words)

	FACTORS of CONVERSION
		kelvin per watt (K/W) degree Fahrenheit second per British thermal unit
		kelvin per watt (K/W) degree Fahrenheit hour square foot per British thermal unit
		meter kelvin per watt (mK/W) degree Fahrenheit hour square foot per* British thermal unit
	www.themeter.net /conv20_e.htm (187 words)

	The True Physics Project - Leaving Certificate Physics Definitions for students in Ireland
		The kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
		When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles.
		The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.
	www.physics.ie /students/units.html (233 words)

	Converter of Heat Units
		watt per meter kelvin [W/(m·K)] 1.441 314 E-01 British thermal unit
		watt per meter kelvin [W/(m·K)] 5.192 204 E+02 British thermal unit
		To Convert From To Multiply By clo square meter kelvin per watt (m²·K/W) 1.55 E-01 degree Fahrenheit hour square foot per British thermal unit
	www.members.optusnet.com.au /ncrick/converters/heat.html (800 words)

	[No title]
		One Unit Per Quantity — The great advantage of SI is that there is one, and only one, unit for each physical quantity — the meter for length (L), kilogram (instead of gram) for mass (m), second for time (t), etc. From these elemental units, units for all other mechanical quantities are derived.
		Thus, in a coherent system in which the meter is the unit of length, the square meter is the unit of area; but the are and hectare are not coherent.
		Compound Units For a unit name (not a symbol) derived as a quotient (for example, for kilometers per hour), it is preferable not to use a slash) (/) as a substitute for "per" except where space is limited and a symbol might not be understood.
	www.seg.org /publications/tech-stand/seg_se_metric_1980.doc (10893 words)

	[No title]
		The candela is the luminous intensity, in the perpendicular direction, of a surface of 1/600,000 square meter of a flbody at the temperature of freezing platinum under a pressure of 101,325 newtons per square meter.
		The meter is the length equal to 1,650,763.73 wavelengths in vacuum of the radiation corresponding to the transition between the levels 2p sub 10, and 5d sub 5 of the krypton-86 atom.
		Revolutions per minute may be written only as r/min, miles per hour may be written only as mi./hr, and inches per second may be written only as in./s and so on.
	textfiles.planetmirror.com /fun/stndrds (1249 words)

	IEP-SAC - ABCs of Metrology
		At the same time, the meter was redefined as the length equal to 1 650 763.73 wavelengths in vacuum of the radiation corresponding to the transition between the level 2p10 and 5d5 of the krypton-86 atom.
		kelvin (K) The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
		Examples are: meter (symbol m), newton (symbol N), etc. An exception is the symbol 'L' for liter, which is a preferred symbol for liter in the United States.
	www.iepsac.org /papers/p07c06.htm (1648 words)

	Watt per meter kelvin
		In the SI system of units, thermal conductivity is measured in watts permetre-kelvin, (W·m
		Diamonds of any size are notably cool to the touchbecause of their high thermal conductivity, perhaps the origin of the term "ice."
		The reciprocal of thermal conductivity is thermal resistivity, measured in kelvin-meters per watt(K·m·W
	www.therfcc.org /watt-per-meter-kelvin-19894.html (490 words)

	Research Facilities--Guide to NIST
		Equipment as large as 1.5 meters by 2.0 meters by 3.0 meters can be tested in high-level test fields up to 1000 volts per meter.
		With a capacity of 53.4 meganewtons and a height of 23.7 meters, it is one of the largest in the world.
		Measuring 20 meters on each side, the test arena consists of three separate areas with increasing degrees of verisimilitude and difficulty.
	www.nist.gov /public_affairs/guide/facilities_page.htm (11937 words)

	SI Units & Standards
		The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2E-7 newton per meter of length.
		The candela is the luminous intensity, in the perpendicular direction, of a surface of 1/600,000 square meter of a flbody at the temperature of freezing platinum under a pressure of 101,325 newtons per square meter.
		Some examples: ten-thousand grams is written; 10 kg, 20,000 cycles per second is written; 20 kHz, 10-million hertz is written; 10 MHz, and 250 billionths of a weber per meter of magnetic flux is written; 250 nWb/m.
	www.teamrocs.com /technical/pages/siunits.htm (1422 words)

	No. 1860: Mass, Length, and Time
		In the English and Metric systems, those basic units were all based on changeable features of the world around us.
		kelvin = (1/273.16) of the absolute temperature of the triple point of water.
		watt = unit of power or energy in a unit time.
	www.uh.edu /engines/epi1860.htm (664 words)

	Various SI (System International) Derived Units
		A newton is the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared
		If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry
		One watt is a unit of power, which is equivalent to one joule of energy per second
	www.aqua-calc.com /ref_si_units_derived.php (263 words)

	Decision imposing the BiH Law on Measuring Units, introducing EU standards
		The meter is 1/2999 792 458 of the distance light travels in a vacuum in one second.
		The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length and negligible cross circular section, and placed one meter apart in a vacuum, would produce between these conductors a force equal to 2 X 10-7 newton per meter of length.
		The Kelvin is the thermodynamic temperature that equals 1/273 of the thermodynamic temperature of the triple point of water.
	www.ohr.int /print/?content_id=42 (1763 words)

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