KELVIN William Thomas, Baron (1824-1907), British physicist and mathematician, after whom the absolute TEMPERATURE scale is named. The installation of the Atlantic submarine telephone cable was made possible thanks to ... ... Scientific and technical encyclopedic dictionary

- (K), SI unit of thermodynamic. temperature equal to 1/273.16 of the thermodynamic part. triple point temperature of water. Named after the English physicist W. Thomson (Lord Kelvin, W. Thomson, Lord Kelvin). Until 1968, it was called the degree Kelvin (°K). Used as a… Physical Encyclopedia

kelvin- K A temperature unit that characterizes the noise temperature in radio engineering. The Kelvin (K) scale is related to the Celsius (t °C) and Fahrenheit (t °F) scales by two simple relationships: K=t °C+273 and t °C=5/9 (t °F 32). t … Technical Translator's Handbook

KELVIN, see Thomson W... Modern Encyclopedia

A unit of thermodynamic temperature equal to 1/273.16 of the thermodynamic temperature of the triple point of water. It is designated K, until 1968 it was called the Kelvin degree (.K), named after W. Thomson (Kelvin). Unit of the International Practical ... ...

See Thomson W... Big Encyclopedic Dictionary

Exist., number of synonyms: 1 unit (830) ASIS synonym dictionary. V.N. Trishin. 2013 ... Synonym dictionary

- (K, named after physicist Kelvin) a unit of temperature according to the International System of Units (SI). IK=1°С. The temperature in Kelvin is measured from absolute zero, and in degrees Celsius (t) is converted to Kelvin by a simple subtraction: 273.15 t. ... ... Ecological dictionary

Kelvin- Kelvin, K - the basic unit of temperature or the degree of heating of a body according to the thermodynamic temperature scale, in which the temperature of the triple point of water is set to 273.16K (exactly). For zero thermodynamic temperature ... ... Encyclopedia of terms, definitions and explanations of building materials

Kelvin- KELVIN, see Thomson W.. ... Illustrated Encyclopedic Dictionary

KELVIN- unit of thermodynamic temperature on the Kelvin scale in SI; denoted K (until 1968 it was called the degree Kelvin (°K)). 1 K is equal to 1/273.16 of the thermodynamic temperature of the equilibrium point of ice, water and its vapor (the triple point of water), 1 K = 1 ... Great Polytechnic Encyclopedia

Books

• William Thomson Lord Kelvin. 1824 1907 , V. Lebedinsky. Reproduced in the original author's spelling of the 1924 edition (Leningrad publishing house). AT…
• William Thomson Lord Kelvin. 1824–1907 , V. Lebedinsky. This book will be produced in accordance with your order using Print-on-Demand technology. Reproduced in the original author's spelling of the 1924 edition (Leningrad publishing house ...

The year to change the definition of kelvin to get rid of the hard-to-reproduce conditions of the triple point of water. In the new definition, the kelvin will be expressed in terms of the second and the value of Boltzmann's constant.

Multiples and submultiples

Decimal multiples and submultiples are formed using standard SI prefixes.

Multiples				Dolnye
magnitude	title	designation		magnitude	title	designation
10 1 K	dekakelvin	yesK	daK	10 −1 K	decikelvin	dK	dK
10 2 K	hectokelvin	gK	hK	10 −2 K	centkelvin	sK	cK
10 3 K	kilokelvin	kk	kK	10 −3 K	millikelvin	mK	mK
10 6 K	megakelvin	MK	MK	10 −6 K	microkelvin	MK	µK
10 9 K	gigakelvin	GC	GK	10 −9 K	nanokelvin	nK	nK
10 12 K	terakelvin	TC	TK	10 −12 K	picokelvin	PC	pK
10 15 K	petakelvin	PC	PK	10 −15 K	femtokelvin	fc	fK
10 18 K	exakelvin	EC	EK	10 −18 K	attokelvin	AK	aK
10 21 K	zettakelvin	ZK	ZK	10 −21 K	zeptokelvin	zK	zK
10 24 K	yottakelvin	IR	YK	10 −24 K	joctokelvin	IR	yK
application is not recommended

Notes

• Gradsky Alexander
• Degree Rankine

See what "Degree Kelvin" is in other dictionaries:

Degree Kelvin- unit of thermodynamic temperature; designation °K; named after W. Thomson, Lord Kelvin. Since 1968 - another name: kelvin; designation K. William (William) Thomson, Lord Kelvin William Thomson, lord Kelvin (1824–1907) English physicist, one of ...

KELVIN- [but the name of the English. physicist W. Thomson (W. Thomson, 1824 1907. from 1892 Lord Kelvin, Kelvin)] old name unit. thermodynamic temperature (denoted °K). R 1967 G. K. replaced by Kelvin (designation K) ... Big encyclopedic polytechnic dictionary

Degree (temperature)- This term has other meanings, see Degree. Thermometer with two scales ... Wikipedia

Kelvin degree- see Degree Kelvin ... The fate of eponyms. Dictionary-reference

Degree Reaumur- temperature unit; designation °R; 1 °R is equal to 1/80 of the temperature interval between the melting points of ice (0 °R) and the boiling points of water (80 °R) at normal atmospheric pressure, i.e. 1 °R = 1.25 °C. Named after R. A. Reaumur. Currently not… The fate of eponyms. Dictionary-reference

Fahrenheit- temperature unit; designation °F; named after D. G. Fahrenheit. On the Fahrenheit scale, at normal atmospheric pressure, the melting point of ice is +32°F and the boiling point of water is +212°F; 1 °F = 1/180 of the difference between these temperatures. Range 0°…+100° to… … The fate of eponyms. Dictionary-reference

Degree Celsius- a widespread unit of temperature measurement (non-systemic, but allowed for use along with the kelvin, the SI unit, the International System of Units); designation °C; named after A. Celsius. On the Celsius scale at normal atmospheric ... ... The fate of eponyms. Dictionary-reference

Kelvin scale- see Degree Kelvin ... The fate of eponyms. Dictionary-reference

Degree Dalton- (°Da or °D[unsourced 154 days]) historical unit of temperature. It has no definite meaning (in units of traditional temperature scales, such as the Kelvin, Celsius or Fahrenheit scale), since the scale ... ... Wikipedia

degrees Kelvin- Degree of the absolute temperature scale [A.S. Goldberg. English Russian Energy Dictionary. 2006] Topics energy in general EN absolute degree … Technical Translator's Handbook

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Initial value

Converted value

Kelvin degree Celsius degree Fahrenheit degree Rankine degree Réaumur Planck temperature

More about temperature

General information

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When buying a luminaire and a lamp, you pay attention to the appearance. On the packaging of lighting fixtures, the word “Kelvin” or the letter “K” with a four-digit number are often found, which is not entirely clear marking. Let's find out what kelvins are in a light bulb and how they are measured.

What are kelvins in a light bulb?

Indeed, when choosing a lamp or light bulb on their packaging, one often encounters either the phrase “Cold” or “Warm” or a four-digit number with the letter “K”. This is a serious characteristic for a light source, along with its power and design. The color temperature is measured in kelvins, which determines the shade of the glow and the mood that the lamp creates. If you do not pay attention to this value, all the light bulbs in your room will glow in different shades - from bluish to yellowish. Let's take a closer look at this value and how it is measured.

What else is measured in Kelvin?

Temperature is measured in Kelvin. Zero Kelvin is -273 degrees Celsius. This means that in order to convert degrees Celsius to Kelvin, you need to add the number 273 and vice versa to Celsius - subtract. Initially, this value was assumed as a unit of measurement relative to the temperature of the triple point of water. This is a state where water can simultaneously exist in three states of aggregation. In physical formulas, Kelvin is often used for calculations, like degrees Celsius, and it becomes necessary to translate for the correct calculations.

Where is the name from? History reference

The unit is named after the physicist William Thompson, "Lord Kelvin Larg", the same name as the river that flowed through the campus of the University of Glasgow. The value was proposed in 1848 and zero Kelvin is the same as absolute zero. It may also be called "Degree Kelvin" - that was the name it bore until 1968.

Color temperature and lighting how are they related?

Usually the color temperature of the lamp is indicated in thousands, for example 2700, 3200 or 4000 K. These numbers are taken for a reason. They reflect the color spectrum emitted by a completely black body. This physical concept describes a body that absorbs light completely. But in addition to absorbing properties, it is also an excellent emitter. When heated, it emits light.

At the same time, when heated, it glows like metal, changing color depending on the degree of heating. This is where the concept of color temperature came from, which is convenient to use when describing the characteristics of a lamp.
In reality, the sun has the radiating properties of a black body as close as possible, and black holes have absorbing properties.

Cold and warm lights

The lower the color temperature, the warmer the light will be. Warm tones are those that are close to yellow and red. Cold light bulbs give off blue in their glow. Typically, the color temperatures of such light sources are in the range above 4000 K.

How to choose a lamp by color temperature?

If you choose, for example, a floodlight for street lighting, you will be offered mainly halogen lamps and LED fixtures. At the same time, the temperature of halogens is about 4000 K, and LEDs are offered to choose from 2700 - warm tones, to cold lamps with a color temperature of more than 4000 K. Visually, cold ones seem brighter. It has to do with vision.


On the packaging of lamps from bona fide manufacturers, the temperature in Kelvin is always indicated. This will help you choose the right lighting and avoid situations when light bulbs of different shades are screwed into a multi-arm chandelier.

Where else is it applied?

Very common in photography and videography, the setting that adjusts the camera to the desired lighting is called "White Balance". It is needed to ensure that the frames are as natural as possible. For example, lamps on photo flashes at 5500 and 5600, studio light can have different temperatures, and shooting outside the studio is generally a difficult process to control.

The effect of the White Balance setting on the picture in the frame

How to measure?

A device called "Spectrometer" was created to measure the quantity of interest to us. However, it is expensive. There are two-zone and three-zone spectrometers. Two-zone measure the ratio of the blue and red components of the spectrum, and three-zone - blue-red and red-green, which can improve the quality of measurements. Currently, the latter type is more often used, an example of such a device is the MinoltaColor Meter. Incidentally these measurements can be used as exposure meters and light meters.