Which of the Following Conditions is Unaffected by Physical Activity

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Scale and unit of measurement of measurement for temperature

caste Celsius

A thermometer calibrated in degrees Celsius

General data
Unit system SI
Unit of Temperature
Symbol °C
Named after Anders Celsius

in …
… is equal to …
SI base units


+ 273.xv M
Regal/The states units



+ 32 °F

degree Celsius
is the unit of temperature on the
Celsius scale,[1]
(originally known as the
centigrade calibration),[2]
one of ii temperature scales used in the International System of Units (SI), aslope the Kelvin scale. The caste Celsius (symbol:
°C) tin can refer to a specific temperature on the Celsius scale or a unit to bespeak a difference or range between two temperatures. Information technology is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale in 1742. Before being renamed to honour Anders Celsius in 1948, the unit was called
centigrade, from the Latin
centum, which ways 100, and
gradus, which means steps. Almost major countries use this scale; the other major calibration, Fahrenheit, is nonetheless used in the United States, some isle territories, and Liberia. The Kelvin scale is of use in the sciences, with 0 K (−273.xv °C) representing accented zero.

Since 1743 the Celsius scale has been based on 0 °C for the freezing point of h2o and 100 °C for the boiling point of water at 1 atm pressure. Prior to 1743 the values were reversed (i.due east. the boiling point was 0 degrees and the freezing point was 100 degrees). The 1743 scale reversal was proposed past Jean-Pierre Christin.

By international agreement, between 1954 and 2019 the unit of measurement
degree Celsius
and the Celsius scale were divers past absolute zippo and the triple indicate of water. Afterward 2007, it was clarified that this definition referred to Vienna Standard Mean Ocean Water (VSMOW), a precisely defined h2o standard.[three]
This definition also precisely related the Celsius scale to the scale of the Kelvin, the SI base of operations unit of thermodynamic temperature with symbol K. Absolute zero, the lowest temperature possible, is divers as being exactly 0 K and −273.15 °C. Until nineteen May 2019, the temperature of the triple point of water was defined equally exactly 273.sixteen K (0.01 °C).[4]

On twenty May 2019, the kelvin was redefined and so that its value is now determined past the definition of the Boltzmann constant rather than being defined past the triple point of VSMOW. This means that the triple betoken is now a measured value, non a defined value. The newly-defined verbal value of the Boltzmann constant was selected so that the measured value of the VSMOW triple point is exactly the same as the older defined value to within the limits of accuracy of gimmicky metrology. The temperature in degree Celsius is now defined every bit the temperature in kelvins subtracted by 273.xv,[5]
meaning that a temperature departure of one caste Celsius and that of 1 kelvin are exactly the aforementioned,[7]
and that the degree Celsius remains exactly equal to the kelvin (i.e., 0 °C remains exactly 273.15 K).



An illustration of Anders Celsius’s original thermometer. Note the reversed scale, where 100 is the freezing point of water and 0 is its boiling point.

In 1742, Swedish astronomer Anders Celsius (1701–1744) created a temperature calibration that was the contrary of the scale at present known as “Celsius”: 0 represented the boiling indicate of h2o, while 100 represented the freezing point of water.[8]
In his newspaper
Observations of two persistent degrees on a thermometer, he recounted his experiments showing that the melting point of ice is essentially unaffected by pressure. He likewise determined with remarkable precision how the humid point of water varied as a role of atmospheric pressure. He proposed that the zero signal of his temperature scale, being the boiling point, would be calibrated at the mean barometric pressure at mean ocean level. This pressure level is known equally one standard atmosphere. The BIPM’s tenth General Conference on Weights and Measures (CGPM) in 1954 defined one standard temper to equal precisely one,013,250 dynes per square centimeter (101.325 kPa).[9]

In 1743, the Lyonnais physicist Jean-Pierre Christin, permanent secretary of the Academy of Lyon, inverted the Celsius scale and so that 0 represented the freezing point of h2o and 100 represented the boiling betoken of water. Some credit Christin for independently inventing the reverse of Celsius’ original scale, while others believe Christin simply reversed Celsius’ calibration.[10]
On 19 May 1743 he published the blueprint of a mercury thermometer, the “Thermometer of Lyon” congenital by the craftsman Pierre Casati that used this scale.[12]

In 1744, coincident with the death of Anders Celsius, the Swedish botanist Carl Linnaeus (1707–1778) reversed Celsius’due south scale.[15]
His custom-made “linnaeus-thermometer”, for apply in his greenhouses, was made past Daniel Ekström, Sweden’southward leading maker of scientific instruments at the time, whose workshop was located in the basement of the Stockholm observatory. Equally frequently happened in this historic period before modern communications, numerous physicists, scientists, and instrument makers are credited with having independently adult this same scale;[xvi]
amid them were Pehr Elvius, the secretary of the Royal Swedish Academy of Sciences (which had an instrument workshop) and with whom Linnaeus had been corresponding; Daniel Ekström [sv], the instrument maker; and Mårten Strömer (1707–1770) who had studied astronomy under Anders Celsius.

The first known Swedish document[17]
reporting temperatures in this mod “forward” Celsius scale is the newspaper
Hortus Upsaliensis
dated xvi December 1745 that Linnaeus wrote to a pupil of his, Samuel Nauclér. In it, Linnaeus recounted the temperatures inside the orangery at the University of Uppsala Botanical Garden:

since the caldarium (the hot part of the greenhouse) by the angle of the windows, merely from the rays of the sun, obtains such rut that the thermometer often reaches 30 degrees, although the neat gardener normally takes care not to let information technology rise to more than 20 to 25 degrees, and in wintertime not under 15 degrees

Centigrade vis-à-vis Celsius


Since the 19th century, the scientific and thermometry communities worldwide have used the phrase “centigrade scale” and temperatures were often reported simply every bit “degrees” or, when greater specificity was desired, as “degrees centigrade”, with the symbol °C.

In the French language, the term
also means i hundredth of a gradian, when used for angular measurement. The term
centesimal caste
was later introduced for temperatures[18]
just was as well problematic, as it means gradian (ane hundredth of a right bending) in the French and Spanish languages. The hazard of confusion betwixt temperature and athwart measurement was eliminated in 1948 when the 9th meeting of the General Conference on Weights and Measures and the Comité International des Poids et Mesures (CIPM) formally adopted “degree Celsius” for temperature.[19]

While “Celsius” is the term commonly used in scientific work, “centigrade” remains in common use in English language-speaking countries, particularly in informal contexts.[xx]

While in Commonwealth of australia from 1 September 1972, simply Celsius measurements were given for temperature in weather reports/forecasts,[21]
it was not until February 1985 that the weather forecasts issued by the BBC switched from “centigrade” to “Celsius”.[22]

Common temperatures


Some key temperatures relating the Celsius scale to other temperature scales are shown in the table below.

Cardinal scale relations
Kelvin Celsius Fahrenheit Rankine
Absolute nothing (exactly) 0 Thousand −273.15 °C −459.67 °F 0 °R
Humid point of liquid nitrogen 77.4 K −195.8 °C[23] −320.4 °F 139.3 °R
Sublimation point of dry out ice 195.i K −78 °C −108.4 °F 351.two °R
Intersection of Celsius and Fahrenheit scales 233.15 K −40 °C −40 °F 419.67 °R
Melting indicate of H2O (purified ice)[24] 273.1499 M −0.0001 °C 31.9998 °F 491.6698 °R
Room temperature (NIST standard)[25] 293.15 Chiliad 20.0 °C 68.0 °F 527.69 °R
Normal human body temperature (average)[26] 310.xv K 37.0 °C 98.6 °F 558.27 °R
Water’s boiling point at ane atm (101.325 kPa)
(guess: see Humid point)[b]
373.1339 K 99.9839 °C 211.971 °F 671.6410 °R

Proper name and symbol typesetting


The “degree Celsius” has been the just SI unit whose full unit of measurement name contains an uppercase letter since 1967, when the SI base unit for temperature became the kelvin, replacing the capitalized term
degrees Kelvin. The plural form is “degrees Celsius”.[27]

The full general rule of the International Agency of Weights and Measures (BIPM) is that the numerical value ever precedes the unit, and a space is always used to separate the unit from the number,
e.grand. “xxx.2 °C”
(not “30.2°C” or “30.2° C”).[28]
The only exceptions to this rule are for the unit symbols for degree, minute, and second for plane bending (°, ′, and ″, respectively), for which no space is left betwixt the numerical value and the unit symbol.[29]
Other languages, and various publishing houses, may follow dissimilar typographical rules.

Unicode character


Unicode provides the Celsius symbol at code signal


DEGREE CELSIUS. However, this is a compatibility character provided for roundtrip compatibility with legacy encodings. It easily allows correct rendering for vertically written E Asian scripts, such as Chinese. The Unicode standard explicitly discourages the employ of this character: “In normal use, it is improve to represent degrees Celsius “°C” with a sequence of






DEGREE CELSIUS. For searching, care for these two sequences as identical.”[30]

Temperatures and intervals


The degree Celsius is subject field to the aforementioned rules as the kelvin with regard to the use of its unit name and symbol. Thus, besides expressing specific temperatures along its scale (e.1000. “Gallium melts at 29.7646 °C” and “The temperature outside is 23 degrees Celsius”), the degree Celsius is also suitable for expressing temperature
intervals: differences between temperatures or their uncertainties (e.g. “The output of the heat exchanger is hotter past 40 degrees Celsius”, and “Our standard uncertainty is ±3 °C”).[31]
Considering of this dual usage, i must non rely upon the unit name or its symbol to announce that a quantity is a temperature interval; information technology must be unambiguous through context or explicit argument that the quantity is an interval.[c]
This is sometimes solved by using the symbol °C (pronounced “degrees Celsius”) for a temperature, and C° (pronounced “Celsius degrees”) for a temperature interval, although this usage is non-standard.[32]
Another style to express the same is
“twoscore °C ± 3 Thousand”, which tin be commonly constitute in literature.

Celsius measurement follows an interval system merely not a ratio organization; and information technology follows a relative scale non an accented scale. For example, an object at twenty °C does not accept twice the energy of when it is 10 °C; and 0 °C is non the everyman Celsius value. Thus, degrees Celsius is a useful interval measurement simply does non possess the characteristics of ratio measures like weight or distance.[33]

Coexistence of Kelvin and Celsius scales


In scientific discipline and in engineering science, the Celsius calibration and the Kelvin scale are often used in combination in close contexts, e.1000. “a measured value was 0.01023 °C with an uncertainty of seventy μK”. This exercise is permissible considering the magnitude of the degree Celsius is equal to that of the kelvin. Yet the official endorsement provided past conclusion no. 3 of Resolution 3 of the 13th CGPM,[34]
which stated “a temperature interval may also be expressed in degrees Celsius”, the practice of simultaneously using both °C and K remains widespread throughout the scientific earth as the employ of SI-prefixed forms of the degree Celsius (such equally “μ°C” or “microdegrees Celsius”) to express a temperature interval has not been well adopted.

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Melting and humid points of water


Celsius temperature conversion formulae
from Celsius to Celsius
Fahrenheit [°F] = [°C] ×
 + 32
[°C] = ([°F] − 32) ×
Kelvin [K] = [°C] + 273.15 [°C] = [K] − 273.xv
Rankine [°R] = ([°C] + 273.fifteen) ×
[°C] = ([°R] − 491.67) ×
For temperature
rather than specific temperatures,
one °C = 1 Thou =

 °F =

Comparisons among diverse temperature scales

The melting and humid points of water are no longer role of the definition of the Celsius scale. In 1948, the definition was changed to use the triple point of water.[35]
In 2005 the definition was further refined to use water with precisely divers isotopic composition (VSMOW) for the triple point. In 2019, the definition was changed to use the Boltzmann abiding, completely decoupling the definition of the kelvin from the properties of water. Each of these formal definitions left the numerical values of the Celsius scale identical to the prior definition to within the limits of accuracy of the metrology of the time.

When the melting and boiling points of h2o ceased existence function of the definition, they became measured quantities instead. This is as well true of the triple point.

In 1948 when the 9th Full general Conference on Weights and Measures (CGPM) in Resolution 3 commencement considered using the triple signal of water as a defining point, the triple betoken was so close to beingness 0.01 °C greater than h2o’due south known melting point, information technology was but defined as precisely 0.01 °C. However, later measurements showed that the difference betwixt the triple and melting points of VSMOW is actually very slightly (<0.001 °C) greater than 0.01 °C. Thus, the actual melting signal of ice is very slightly (less than a thousandth of a degree) below 0 °C. Also, defining water’southward triple point at 273.16 K precisely defined the magnitude of each ane °C increment in terms of the absolute thermodynamic temperature calibration (referencing absolute zero). Now decoupled from the actual boiling point of water, the value “100 °C” is hotter than 0 °C – in absolute terms – by a factor of


(approximately 36.61% thermodynamically hotter). When adhering
to the two-point definition for calibration, the boiling point of VSMOW under one standard atmosphere of pressure level was really 373.1339 Chiliad (99.9839 °C). When calibrated to ITS-90 (a calibration standard comprising many definition points and unremarkably used for high-precision instrumentation), the boiling bespeak of VSMOW was slightly less, near 99.974 °C.[36]

This boiling-point difference of 16.one millikelvins betwixt the Celsius calibration’south original definition and the previous 1 (based on absolute zero and the triple point) has little applied meaning in common daily applications because water’s boiling signal is very sensitive to variations in barometric pressure level. For case, an altitude change of only 28 cm (xi in) causes the boiling signal to modify by one millikelvin.

See also


  • Comparison of temperature scales
  • Degree of frost
  • ITS-90
  • Réaumur calibration
  • Thermodynamic temperature



  1. ^

    Co-ordinate to
    The Oxford English Dictionary
    (OED), the term “Celsius’ thermometer” had been used at to the lowest degree equally early equally 1797. Farther, the term “The Celsius or Centigrade thermometer” was again used in reference to a particular blazon of thermometer at least as early as 1850. The OED also cites this 1928 reporting of a temperature: “My altitude was about 5,800 metres, the temperature was 28° Celsius.” However, dictionaries seek to find the primeval use of a word or term and are not a useful resource every bit regards to the terminology used throughout the history of scientific discipline. According to several writings of Dr. Terry Quinn CBE FRS, Director of the BIPM (1988–2004), including
    “Temperature Scales from the early on days of thermometry to the 21st century”
    (PDF). Archived from the original
    on 26 December 2010. Retrieved
    31 May

    (146 KiB)
    equally well as
    (second Edition/1990/Academic Press/0125696817), the term
    in connexion with the centigrade scale was non used whatever by the scientific or thermometry communities until later on the CIPM and CGPM adopted the term in 1948. The BIPM was not even enlightened that “caste Celsius” was in sporadic, non-scientific use before that fourth dimension. Information technology is also noteworthy that the twelve-volume, 1933 edition of OED didn’t even have a list for the discussion
    (only did have listings for both
    in the context of temperature measurement). The 1948 adoption of
    achieved 3 objectives:

    one.    All common temperature scales would have their units named after someone closely associated with them; namely, Kelvin, Celsius, Fahrenheit, Réaumur and Rankine.
    2.    Notwithstanding the of import contribution of Linnaeus who gave the Celsius scale its modern grade, Celsius’south proper name was the obvious choice because it began with the letter C. Thus, the symbol °C that for centuries had been used in association with the name
    could remain in use and would simultaneously inherit an intuitive association with the new name.
    3.    The new name eliminated the ambiguity of the term “centigrade”, freeing it to refer exclusively to the French-language name for the unit of athwart measurement.

  2. ^

    For Vienna Standard Mean Ocean Water at ane standard atmosphere (101.325 kPa) when calibrated solely per the two-point definition of thermodynamic temperature. Older definitions of the Celsius scale in one case divers the boiling point of water under one standard atmosphere as beingness precisely 100 °C. However, the current definition results in a boiling point that is actually 16.1 mK less. For more well-nigh the bodily boiling point of h2o, see VSMOW in temperature measurement. A different approximation uses ITS-90, which approximates the temperature to 99.974 °C

  3. ^

    In 1948, Resolution seven of the 9th CGPM stated,
    “To indicate a temperature interval or difference, rather than a temperature, the give-and-take ‘caste’ in total, or the abridgement ‘deg’ must exist used.”
    This resolution was abrogated in 1967/1968 by Resolution 3 of the 13th CGPM, which stated that
    [“The names “degree Kelvin” and “degree”, the symbols “°K” and “deg” and the rules for their utilize given in Resolution 7 of the 9th CGPM (1948),] …and the designation of the unit of measurement to express an interval or a departure of temperatures are abrogated, only the usages which derive from these decisions remain permissible for the fourth dimension beingness.”
    Consequently, in that location is at present broad freedom in usage regarding how to indicate a temperature interval. The well-nigh important thing is that i’s intention must exist articulate and the basic rule of the SI must exist followed; namely that the unit name or its symbol must not exist relied upon to bespeak the nature of the quantity. Thus, if a temperature interval is, say, x K or 10 °C (which may be written 10 kelvins or 10 degrees Celsius), it must exist unambiguous through obvious context or explicit argument that the quantity is an interval. Rules governing the expressing of temperatures and intervals are covered in the BIPM’s
    “SI Brochure, 8th edition”

    (1.39 MiB).



  1. ^

    “Celsius temperature calibration”.
    Encyclopædia Britannica
    . Retrieved
    19 February
    Celsius temperature scale, also called centigrade temperature scale, scale based on 0 ° for the melting signal of water and 100 ° for the boiling point of water at 1 atm pressure.

  2. ^

    Helmenstine, Anne Marie (15 December 2014). “What Is the Departure Between Celsius and Centigrade?”.
    Chemistry.almost.com. Most.com. Retrieved
    25 April

  3. ^

    “Resolution ten of the 23rd CGPM (2007)”. Retrieved
    27 December

  4. ^

    “SI brochure, department ii.1.1.five”. International Agency of Weights and Measures. Archived from the original on 26 September 2007. Retrieved
    9 May

  5. ^

    “SI Brochure: The International System of Units (SI) – 9th edition”. BIPM. Retrieved
    21 Feb

  6. ^

    “SI base unit of measurement: kelvin (K)”.
    bipm.org. BIPM. Retrieved
    five March

  7. ^

    “Essentials of the SI: Base of operations & derived units”. Retrieved
    9 May

  8. ^

    Celsius, Anders (1742) “Observationer om twänne beständiga grader på en thermometer” (Observations nearly 2 stable degrees on a thermometer),
    Kungliga Svenska Vetenskapsakademiens Handlingar
    (Proceedings of the Royal Swedish Academy of Sciences),
    3 : 171–180 and Fig. i.

  9. ^

    “Resolution 4 of the 10th meeting of the CGPM (1954)”.

  10. ^

    Don Rittner; Ronald A. Bailey (2005):
    Encyclopedia of Chemistry.
    Facts On File, Manhattan, New York City. p. 43.

  11. ^

    Smith, Jacqueline (2009). “Appendix I: Chronology”.
    The Facts on File Dictionary of Weather and Climate. Infobase Publishing. p. 246. ISBN978-1-4381-0951-0.
    1743 Jean-Pierre Christin inverts the fixed points on Celsius’ calibration, to produce the calibration used today.

  12. ^

    Mercure de France
    MEMOIRE sur la dilatation du Mercure dans le Thermométre.
    Chaubert; Jean de Nully, Pissot, Duchesne, Paris. pp. 1609–1610.

  13. ^

    Journal helvétique
    Imprimerie des Journalistes, Neuchâtel. pp. 308–310.

  14. ^

    Memoires pour 50’Histoire des Sciences et des Beaux Arts
    DE LYON.
    Chaubert, París. pp. 2125–2128.

  15. ^

    Citation: Uppsala University (Sweden),
    Linnaeus’ thermometer

  16. ^

    Citation for Christin of Lyons: Le Moyne College,
    Glossary, (Celsius calibration); citation for Linnaeus’s connection with Pehr Elvius and Daniel Ekström: Uppsala University (Sweden),
    Linnaeus’ thermometer; general commendation: The Uppsala Astronomical Observatory,
    History of the Celsius temperature scale

  17. ^

    Citations: University of Wisconsin–Madison,
    Linnæus & his Garden
    and; Uppsala University,
    Linnaeus’ thermometer

  18. ^

    Comptes rendus des séances de la cinquième conférence générale des poids et mesures, réunie à Paris en 1913. Agency international des poids et mesures. 1913. pp. 55, 57, 59. Retrieved
    10 June
    . p. 60:
    …à la température de xx° centésimaux

  19. ^

    “CIPM, 1948 and ninth CGPM, 1948”. International Bureau of Weights and Measures. Archived from the original on 5 April 2021. Retrieved
    9 May

  20. ^

    “centigrade, adj. and due north.”
    Oxford English language Lexicon. Oxford University Press. Retrieved
    20 November

  21. ^

    “Temperature and Pressure go Metric”
    (PDF). Commonwealth Bureau of Meteorology. 1 September 1972. Retrieved
    16 February

  22. ^

    1985 BBC Special: A Change In The Weather
    on YouTube

  23. ^

    Lide, D.R., ed. (1990–1991).
    Handbook of Chemistry and Physics.
    71st ed. CRC Press. p. 4–22.

  24. ^

    The ice indicate of purified water has been measured at


    degrees Celsius – run across
    Magnum, B.Westward. (June 1995). “Reproducibility of the Temperature of the Ice Point in Routine Measurements”
    Nist Technical Annotation.
    1411. Archived from the original
    on 10 July 2007. Retrieved
    xi February

  25. ^

    “SI Units – Temperature”. NIST Office of Weights and Measures. 2010. Retrieved
    21 July

  26. ^

    Elert, Glenn (2005). “Temperature of a Healthy Human being (Body Temperature)”.
    The Physics Factbook
    . Retrieved
    22 Baronial

  27. ^

    “Unit of thermodynamic temperature (kelvin)”.
    The NIST Reference on Constants, Units, and Uncertainty: Historical context of the SI. National Institute of Standards and Applied science (NIST). 2000. Archived from the original on eleven November 2004. Retrieved
    16 November

  28. ^

    SI Brochure, Department v.iii.3.

  29. ^

    For more than data on conventions used in technical writing, see the informative
    SI Unit rules and manner conventions
    by the NIST as well as the BIPM’southward SI brochure: Subsection five.3.3,
    Formatting the value of a quantity. Archived 5 July 2014 at the Wayback Machine

  30. ^

    The Unicode Standard, Version 9.0
    (PDF). Mountain View, CA, USA: The Unicode Consortium. July 2016. ISBN978-one-936213-xiii-ix
    . Retrieved
    20 April

  31. ^

    Determination No. 3 of Resolution 3 of the 13th CGPM.

  32. ^

    H.D. Young, R. A. Freedman (2008). University Physics with Mod Physics (12th ed.). Addison Wesley. p. 573.

  33. ^

    This fact is demonstrated in the book
    Biostatistics: A Guide to Blueprint, Assay, and Discovery
    Past Ronald Due north. Forthofer, Eun Sul Lee and Mike Hernandez

  34. ^

    “Resolution iii of the 13th CGPM (1967)”.

  35. ^

    “Resolution 3 of the 9th CGPM (1948)”. International Bureau of Weights and Measures. Retrieved
    ix May

  36. ^

    Citation: London South Bank University,
    Water Structure and Beliefs, notes c1 and c2

External links


The dictionary definition of
at Wiktionary

  • NIST,
    Bones unit of measurement definitions: Kelvin
  • The Uppsala Astronomical Observatory,
    History of the Celsius temperature scale
  • London South Bank University,
    H2o, scientific data
  • BIPM,
    SI brochure, section 2.i.1.5, Unit of measurement of thermodynamic temperature
    Comparison of temperature scales

Which of the Following Conditions is Unaffected by Physical Activity

Source: https://en.wikipedia.org/wiki/Celsius

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