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Text of the page (random words):
human body s temperature 14 according to a german story fahrenheit actually chose the lowest air temperature measured in his hometown danzig now gdańsk poland in winter 1708 09 as 0 f and only later had the need to be able to make this value reproducible using brine 17 failed verification according to a letter fahrenheit wrote to his friend herman boerhaave 18 his scale was built on the work of ole rømer whom he had met earlier in rømer scale brine freezes at zero water freezes and melts at 7 5 degrees body temperature is 22 5 and water boils at 60 degrees fahrenheit multiplied each value by 4 in order to eliminate fractions and make the scale more fine grained he then re calibrated his scale using the melting point of ice and normal human body temperature which were at 30 and 90 degrees he adjusted the scale so that the melting point of ice would be 32 degrees and body temperature 96 degrees so that 64 intervals would separate the two allowing him to mark degree lines on his instruments by simply bisecting the interval 6 times since 64 2 6 19 20 fahrenheit soon after observed that water boils at about 212 degrees using this scale 21 the use of the freezing and boiling points of water as thermometer fixed reference points became popular following the work of anders celsius and these fixed points were adopted by a committee of the royal society led by henry cavendish in 1776 77 22 23 under this system the fahrenheit scale is redefined slightly so that the freezing point of water was exactly 32 f and the boiling point was exactly 212 f or 180 degrees higher it is for this reason that normal human body temperature is approximately 98 6 f oral temperature on the revised scale whereas it was 90 on fahrenheit s multiplication of rømer and 96 on his original scale 24 in the present day fahrenheit scale 0 f no longer corresponds to the eutectic temperature of ammonium chloride brine as described above instead that eutectic is at approximately 4 f on the final fahrenheit scale note 2 the rankine temperature scale was based upon the fahrenheit temperature scale with its zero representing absolute zero instead usage edit general edit countries by usage fahrenheit f fahrenheit f and celsius c celsius c the fahrenheit scale was the primary temperature standard for climatic industrial and medical purposes in anglophone countries until the 1960s in the late 1960s and 1970s the celsius scale replaced fahrenheit in almost all of those countries with the notable exception of the united states fahrenheit is used in the united states its territories and associated states all serviced by the u s national weather service as well as the british cayman islands for everyday applications the fahrenheit scale is in use in u s for all temperature measurements including weather forecasts cooking and food freezing temperatures however for scientific research the scale is celsius and kelvin 25 united states edit early in the 20th century halsey and dale suggested that reasons for resistance to the use of the centigrade now celsius system in the u s included the larger size of each degree celsius and the lower zero point in the fahrenheit system and claimed the fahrenheit scale is more intuitive than celsius for describing outdoor temperatures in temperate latitudes with 100 f being a hot summer day and 0 f a cold winter day 26 canada edit canada has passed legislation favoring the international system of units while also maintaining legal definitions for traditional canadian imperial units 27 canadian weather reports are conveyed using degrees celsius with occasional reference to fahrenheit especially for cross border broadcasts fahrenheit is still used on virtually all canadian ovens 28 thermometers both digital and analog sold in canada usually employ both the celsius and fahrenheit scales 29 30 31 european union edit in the european union it is mandatory to use kelvins or degrees celsius when quoting temperature for economic public health public safety and administrative purposes though degrees fahrenheit may be used alongside degrees celsius as a supplementary unit 32 united kingdom edit most british people use celsius 33 however the use of fahrenheit still may appear at times alongside degrees celsius in the print media with no standard convention for when the measurement is included for example the times has an all metric daily weather page but includes a celsius to fahrenheit conversion table 34 some uk tabloids have adopted a tendency of using fahrenheit for mid to high temperatures 35 it has been suggested that the rationale to keep using fahrenheit was one of emphasis especially for high weather temperatures 6 c sounds colder than 21 f and 94 f sounds more sensational than 34 c 36 unicode representation of symbol edit unicode provides the fahrenheit symbol at code point u 2109 degree fahrenheit however this is a compatibility character encoded for roundtrip compatibility with legacy encodings the unicode standard explicitly discourages the use of this character the sequence u 00b0 degree sign u 0046 f latin capital letter f is preferred over u 2109 degree fahrenheit and those two sequences should be treated as identical for searching 37 see also edit energy portal comparison of temperature scales degree of frost metrication outline of metrology and measurement notes edit sal armoniac was an impure form of ammonium chloride the french chemist nicolas lémery 1645 1715 discussed it in his book cours de chymie a course of chemistry 1675 describing where it occurs naturally and how it can be prepared artificially it occurs naturally in the deserts of northern africa where it forms from puddles of animal urine it can be prepared artificially by boiling 5 parts of urine 1 part of sea salt and ½ part of chimney soot until the mixture has dried the mixture is then heated in a sublimation pot until it sublimates the sublimated crystals are sal armoniac see nicolas lémery cours de chymie 7th ed paris france estienne michallet 1688 chapitre xvii du sel armoniac pp 338 339 english translation nicolas lémery with james keill trans a course of chymistry 3rd ed london england walter kettilby 1698 chap xvii of sal armoniack p 383 available on line at heinrich heine university düsseldorf germany eutectic temperature of ammonium chloride and water is listed as 15 9 c 3 38 f and as 15 4 c 4 28 f in respectively peppin s s huppert h e worster m g 2008 steady state solidification of aqueous ammonium chloride pdf j fluid mech 159 cambridge university press 472 table 1 bibcode 2008jfm 599 465p doi 10 1017 s0022112008000219 s2cid 30271164 archived pdf from the original on 19 january 2010 barman n nayak a k chattopadhyay h 2021 solidification of a binary solution nh 4 cl h 2 o on an inclined cooling plate a parametric study pdf procedia materials science 7 456 table 1 doi 10 1016 j mspro 2014 07 288 archived pdf from the original on 15 january 2019 references edit balmer robert t 2010 modern engineering thermodynamics academic press p 9 isbn 978 0 12 374996 3 retrieved 17 july 2011 1 2 fahrenheit temperature scale encyclopædia britannica online retrieved 25 september 2015 fahrenheit facts history conversion formulas live science retrieved 9 february 2018 benham elizabeth 6 october 2020 busting myths about the metric system us national institute of standards and technology nist appendix c general tables of units of measurement pdf nist handbook 44 specifications tolerances and other technical requirements for weighing and measuring devices 2022 us national institute of standards and technology nist 29 november 2021 archived pdf from the original on 27 december 2021 us department of commerce noaa national weather service www weather gov retrieved 30 november 2025 us department of commerce noaa wso palau www weather gov retrieved 30 november 2025 cayman islands weather forecast service provider cinws www weather gov ky retrieved 30 november 2025 50 years of celsius weather forecasts time to kill off fahrenheit for good metric views archived from the original on 2 october 2020 retrieved 28 july 2019 celsius anders 1742 observationer om twänne beständiga grader på en thermometer observations about two stable degrees on a thermometer kungliga svenska vetenskapsakademiens handlingar proceedings of the royal swedish academy of sciences 3 171 180 and fig 1 1 2 boyes walt 2009 instrumentation reference book butterworth heinemann pp 273 274 isbn 978 0 7506 8308 1 retrieved 17 july 2011 dingman s l 26 february 2009 fluvial hydraulics oxford university press usa p 522 isbn 978 0 19 517286 7 sogin harold h hassan kamal eldin june 1956 a design manual for regenerative heat exchangers of the rotary type wright air development center p xii 1 2 3 fahrenheit daniele gabr 1724 experimenta observationes de congelatione aquæ in vacuo factæ a d g fahrenheit r s s experiments and observations on water freezing in the void by d g fahrenheit r s s philosophical transactions of the royal society of london vol 33 no 382 page 78 march april 1724 cited and translated in http www sizes com 80 units temperature_fahrenheit htm friend j newton 6 march 1937 the origin of fahrenheit s thermometric scale nature 139 3514 395 398 doi 10 1038 139395a0 machin graham 1 october 2024 evolution of temperature measurement beginnings progress and prospects journal of physics conference series 2877 1 5 doi 10 1088 1742 6596 2877 1 012112 wetterlexikon lufttemperatur in german deutscher wetterdienst archived from the original on 15 october 2013 retrieved 13 december 2013 ernst cohen and w a t cohen de meester chemisch weekblad volume 33 1936 pages 374 393 cited and translated in http www sizes com 80 units temperature_fahrenheit htm frautschi steven c richard p olenick tom m apostol david l goodstein 14 january 2008 the mechanical universe mechanics and heat cambridge university press p 502 isbn 978 0 521 71590 4 adams cecil 15 december 1989 on the fahrenheit scale do 0 and 100 have any special significance the straight dope fahrenheit daniele gabr 1724 experimenta circa gradum caloris liquorum nonnullorum ebullientium instituta archived 29 june 2014 at the wayback machine experiments performed concerning the degree of heat of some boiling liquids philosophical transactions of the royal society of london 33 1 3 for an english translation see le moyne college syracuse new york hasok chang inventing temperature measurement and scientific progress pp 8 11 oxford university press 2004 isbn 0198038240 cavendish henry heberden william aubert alexander luc jean andre de maskelyne nevil horsley samuel planta joseph 28 december 1777 xxxvii the report of the committee appointed by the royal society to consider of the best method of adjusting the fixed points of thermometers and of the precautions necessary to be used in making experiments with those instruments philosophical transactions of the royal society of london 67 816 857 doi 10 1098 rstl 1777 0038 issn 0261 0523 elert glenn forsberg c wahren l k 2002 temperature of a healthy human body temperature scandinavian journal of caring sciences 16 2 122 8 doi 10 1046 j 1471 6712 2002 00069 x pmid 12000664 archived from the original on 26 september 2010 retrieved 12 april 2008 782 aerodrome reports and forecasts a user s handbook to the codes world meteorological organization retrieved 23 september 2009 halsey frederick a dale samuel s 1919 the metric fallacy 2 ed the american institute of weights and measures pp 165 166 176 177 retrieved 19 may 2009 canadian units of measurement department of justice weights and measures act r s c 1985 c w 6 17 may 2011 archived from the original on 13 may 2011 retrieved 5 june 2011 pearlstein steven 4 june 2000 did canada go metric yes and no the seattle times archived from the original on 19 december 2024 retrieved 5 june 2011 example of analog thermometer frequently used in canada archived from the original on 6 july 2011 retrieved 6 june 2011 example of digital thermometer frequently used in canada archived from the original on 6 july 2011 retrieved 6 june 2011 department of justice 26 february 2009 canadian weights and measures act federal government of canada archived from the original on 10 august 2011 retrieved 17 july 2011 statutory instrument 2009 3046 weights and measures the units of measurement regulations 2009 pdf archived from the original pdf on 1 january 2017 the secretary of state being a minister designated a for the purposes of section 2 2 of the european communities act 1972 b in relation to units of measurement to be used for economic health safety or administrative purposes in exercise of the powers conferred by that subsection makes the following regulations the media like fahrenheit but most brits think in celsius opinium 24 july 2013 retrieved 21 june 2021 weather the times 3 july 2013 p 55 roy greenslade 29 may 2014 newspapers run hot and cold over celsius and fahrenheit the guardian measure for measure the times 23 february 2006 22 2 the unicode standard version 8 0 pdf mountain view ca usa the unicode consortium august 2015 isbn 978 1 936213 10 8 archived pdf from the original on 5 september 2015 retrieved 6 september 2015 external links edit media related to fahrenheit temperature at wikimedia commons the dictionary definition of fahrenheit at wiktionary daniel gabriel fahrenheit polish born dutch physicist encyclopædia britannica at auction one of only three original fahrenheit thermometers enfilade page for 2012 christie s sale of a fahrenheit mercury thermometer christie s press release si units temperature nist national institute of standards and technology us department of commerce 15 november 2019 retrieved 25 february 2020 v t e scales of temperature celsius delisle fahrenheit gas mark kelvin leiden newton rankine réaumur rømer wedgwood conversion formulas and comparison v t e imperial units comparison with us customary system length twip thousandth of an inch barleycorn inch hand link foot yard fathom rod chain furlong cable mile nautical mile league area square inch square foot square yard perch rood acre square mile volume derived cubic inch cubic foot hoppus cubic yard cubic mile tmcft cooking teaspoon tablespoon fluid ounce cup pint quart trade gallon gallon other chaldron minim gill fluid scruple fluid drachm peck bushel barrel stuck hogshead speed miles per hour mass grain drachm ounce pound mass stone quarter slug long hundred hundredweight ship load ton pressure ksi pounds per square inch other units and measures british thermal unit degree fahrenheit rankine foot candle foot pound foot poundal horsepower horsepower hour kenning pound force pound foot poundal span related systems avoirdupois system english units winchester exchequer english engineering units foot pound second system fps twenty foot equivalent unit v t e united states customary units comparison with imperial unit system length thousandth of an inch inch hand link foot yard rod chain furlong mile statute mile area square...