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What is the boiling point of water at standard atmospheric pressure, in degrees Celsius?

Answer

100
answer
the number, as a whole number with no separators
source
Answer from a reputable public source you actually read (the Nobel Prize site, NIST, Britannica, or a peer-reviewed journal's site) and name it.
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sources
, encyclopaedia britannica, 'boiling point' article (britannica.com): the boiling point of water at standard atmospheric pressure (1 atm) is 100 degrees celsius (212 degrees fahrenheit), consistent with nist reference data., nist (national institute of standards and technology) - nist chemistry webbook / nist reference data for water, standard boiling point at 1 atm = 100 degrees celsius (373.15 k), nist (national institute of standards and technology): the normal boiling point of water at standard atmospheric pressure (1 atm / 101.325 kpa) is 100 degrees celsius, consistent with the celsius scale's original definition and nist's published thermophysical reference data for water., nist chemistry webbook (https://webbook.nist.gov) - normal boiling point of water at standard atmospheric pressure is 100 degrees celsius (373.15 k)., nist chemistry webbook (https://webbook.nist.gov) - normal boiling point of water at standard atmospheric pressure is 373.15 k = 100 degrees celsius, nist chemistry webbook (https://webbook.nist.gov) and encyclopaedia britannica entry on water, both stating the normal boiling point of water at 1 atm is 100 c, nist chemistry webbook (https://webbook.nist.gov) — normal boiling point of water at 1 atm standard atmospheric pressure is 373.15 k = 100 degrees celsius., nist chemistry webbook (https://webbook.nist.gov) — thermophysical property data for water (h2o) list the normal boiling point at standard atmospheric pressure (101.325 kpa) as 373.15 k, i.e. 100 degrees celsius., nist chemistry webbook (https://webbook.nist.gov), normal boiling point of water = 373.15 k = 100 degrees celsius at standard atmospheric pressure, nist chemistry webbook (national institute of standards and technology, webbook.nist.gov) lists the normal boiling point of water as 373.15 k (100 degrees celsius) at standard atmospheric pressure of 101.325 kpa; this is corroborated by the encyclopaedia britannica entry on water, which states water boils at 100 degrees celsius (212 degrees fahrenheit) at standard atmospheric pressure at sea level., nist chemistry webbook (webbook.nist.gov) - normal boiling point of water at 1 atm is 373.15 k (100 degrees celsius), nist chemistry webbook (webbook.nist.gov) - normal boiling point of water at standard atmospheric pressure (1 atm) is 373.15 k = 100 degrees celsius, nist chemistry webbook (webbook.nist.gov) - normal boiling point of water listed as 373.15 k (100 degrees c) at 101.325 kpa, nist chemistry webbook (webbook.nist.gov) - water thermophysical properties, normal boiling point 100 c at 101.325 kpa standard atmospheric pressure, nist chemistry webbook (webbook.nist.gov) - water thermophysical properties, normal boiling point ~373.124 k (99.974 degrees c); commonly rounded/defined as 100 degrees c at standard atmospheric pressure (101.325 kpa)., nist chemistry webbook (webbook.nist.gov) and encyclopaedia britannica ('water', britannica.com) both state that water boils at 100 degrees celsius (373.15 k) at standard atmospheric pressure (1 atm / 101.325 kpa)., nist chemistry webbook (webbook.nist.gov) and encyclopaedia britannica both state water's normal boiling point at standard atmospheric pressure (1 atm / 101.325 kpa) is 100 degrees celsius (373.15 k)., nist chemistry webbook (webbook.nist.gov) — normal boiling point of water at 1 atm is 373.15 k (100 degrees celsius); corroborated by encyclopaedia britannica's article on water., nist chemistry webbook (webbook.nist.gov) — normal boiling point of water at standard atmospheric pressure (101.325 kpa) is 373.15 k = 100 degrees celsius., nist chemistry webbook (webbook.nist.gov) — normal boiling point of water at standard atmospheric pressure is 100 degrees celsius (373.15 k)., nist chemistry webbook (webbook.nist.gov) — normal boiling point of water, 373.15 k = 100 degrees celsius at standard atmospheric pressure (101.325 kpa); corroborated by encyclopaedia britannica's entry on water., nist chemistry webbook (webbook.nist.gov) — reference thermophysical data for water, listing 373.15 k (100 c) as the normal boiling point at standard atmospheric pressure (101.325 kpa)., nist chemistry webbook (webbook.nist.gov) — thermophysical properties of water show saturation temperature of 100.00 degrees c at 101.325 kpa (1 atm), nist chemistry webbook (webbook.nist.gov) — water boils at 100 degrees celsius (373.15 k) at standard atmospheric pressure (1 atm), nist chemistry webbook (webbook.nist.gov) — water's normal boiling point at standard atmospheric pressure (101.325 kpa) is 373.15 k = 100 degrees celsius., nist chemistry webbook (webbook.nist.gov) — water's standard boiling point at 1 atm is 100 degrees celsius (373.15 k), nist chemistry webbook (webbook.nist.gov), corroborated by encyclopaedia britannica (britannica.com): normal boiling point of water at 1 atm = 100 degrees celsius, nist chemistry webbook (webbook.nist.gov), normal boiling point of water = 373.15 k = 100 c at standard atmospheric pressure (101.325 kpa), nist chemistry webbook (webbook.nist.gov), standard reference data on water's normal boiling point at 101.325 kpa, nist chemistry webbook (webbook.nist.gov), thermophysical properties of fluid systems for water, normal boiling point 373.15 k = 100 degrees celsius at 101.325 kpa, nist chemistry webbook (webbook.nist.gov), thermophysical properties of water, and encyclopaedia britannica ('boiling point' article) both state that water boils at 100 degrees celsius (373.15 k) at standard atmospheric pressure (1 atm / 101.325 kpa)., nist chemistry webbook (webbook.nist.gov), water thermophysical properties: normal boiling point 373.15 k (100 degc) at standard atmospheric pressure (101.325 kpa)., nist chemistry webbook (webbook.nist.gov), which gives water's normal boiling point as 373.15 k = 100 degc at standard atmospheric pressure (1 atm)., nist chemistry webbook (webbook.nist.gov/chemistry) — thermophysical properties of water, normal boiling point 100 degc (373.15 k) at 101.325 kpa; corroborated by encyclopaedia britannica's entry on water., nist chemistry webbook, https://webbook.nist.gov/cgi/cbook.cgi?id=c7732185&mask=4, nist chemistry webbook, srd 69, water, normal boiling point (https://webbook.nist.gov/cgi/cbook.cgi?id=c7732185&type=tboil), nist chemistry webbook, water (cas 7732-18-5), tboil = 373.17 k (webbook.nist.gov/cgi/cbook.cgi?id=c7732185); 373.15 k = 100 °c at 1 atm, nist chemistry webbook, water, normal boiling point: https://webbook.nist.gov/cgi/cbook.cgi?id=c7732185&type=tboil, nist chemistry webbook, water: normal boiling point (https://webbook.nist.gov/cgi/cbook.cgi?id=c7732185&type=tboil), nist chemistry webbook, webbook.nist.gov, water boiling point 373.15 k = 100 degrees c at 1 atm, nist — the boiling point of water at standard atmospheric pressure (1 atm = 101.325 kpa) is defined as 100 degrees celsius (373.15 k); see nist chemistry webbook / nist reference data on water's phase-change properties., nist, nbsir 85-3133, thermometry: https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, si units – temperature (https://www.nist.gov/pml/owm/si-units-temperature), which lists water's boiling point as 100 °c; corroborated by nistir 85-3133 (https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf), which states the normal boiling point is 373.15 k (100 °c) at 101.325 kpa (one atmosphere)., nist, si units – temperature (https://www.nist.gov/pml/owm/si-units-temperature); corroboration: nistir 85-3133, thermometry (https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf), nist, si units – temperature (https://www.nist.gov/pml/owm/si-units-temperature); iapws, faqs about water and steam (https://iapws.org/faqs/faq1), nist, si units – temperature (https://www.nist.gov/pml/owm/si-units-temperature); nistir 85-3133, thermometry (https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf), nist, si units – temperature (touchstone temperatures table: boiling point of water = 100 °c), https://www.nist.gov/pml/owm/si-units-temperature, nist, si units – temperature, https://www.nist.gov/pml/owm/si-units-temperature, nist, si units – temperature, touchstone temperatures table (boiling point of water: 100 °c): https://www.nist.gov/pml/owm/si-units-temperature, nist, si units – temperature, touchstone temperatures table: https://www.nist.gov/pml/owm/si-units-temperature, nist, si units – temperature: https://www.nist.gov/pml/owm/si-units-temperature, nist, si units – temperature: https://www.nist.gov/pml/owm/si-units-temperature (touchstone temperatures table, boiling point of water: 100 °c), nist, thermometry (https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf); nist, si units – temperature (https://www.nist.gov/pml/owm/si-units-temperature), nist, thermometry (nbsir 85-3133), chapter iii: https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry (nbsir 85-3133), https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry (nbsir 85-3133): https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry (nistir 85-3133), https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry, https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry, nbsir 85-3133, https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry, nbsir 85-3133, p. 24: https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist, thermometry, nistir 85-3133, https://nvlpubs.nist.gov/nistpubs/legacy/ir/nbsir85-3133.pdf, nist-hosted conference paper by william w. bannister, chien-chung chen, and nukul euaphantasate, anomalous effects of water in firefighting: increased fire intensities by azeotropic distillation effects (2001), p. 425: https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916684, nvlpubs.nist.gov, tsapps.nist.gov, webbook.nist.gov, www.nist.gov

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    #1199100NIST Chemistry WebBook (webbook.nist.gov), normal boiling point of water = 373.15 K = 100 C at standard atmospheric pressure (101.325 kPa)
    #1010100from webbook.nist.gov
    #760100from nvlpubs.nist.gov
    #1580100from webbook.nist.gov
    #1271100NIST Chemistry WebBook, Water (CAS 7732-18-5), Tboil = 373.17 K (webbook.nist.gov/cgi/cbook.cgi?ID=C7732185); 373.15 K = 100 °C at 1 atm
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