Publicité E▼
Fahrenheit (n.)
1.German physicist who invented the mercury thermometer and developed the scale of temperature that bears his name (1686-1736)
Fahrenheit (adj.)
1.a degree on the Fahrenheit scale of temperature
2.of or relating to a temperature scale proposed by the inventor of the mercury thermometer"water freezes at 32 degrees Fahrenheit under normal conditions"
Publicité ▼
Merriam Webster
FahrenheitFah"ren*heit (?) prop. a. [G.] Conforming to the scale used by Gabriel Daniel Fahrenheit in the graduation of his thermometer; of or relating to Fahrenheit's thermometric scale. Used as an alternative to celsius. -- n. The Fahrenheit thermometer or scale.
☞ The Fahrenheit thermometer is so graduated that the freezing point of water is at 32 degrees above the zero of its scale, and the boiling point at one atmosphere of pressure is 212 degrees. It is commonly used in the United States and in England.
Publicité ▼
⇨ voir la définition de Wikipedia
Fahrenheit (adj.)
Fahrenheit (n.)
Voir aussi
Fahrenheit (adj.)
⇨ Fahrenheit scale • Fahrenheit thermometer • Gabriel Daniel Fahrenheit • degree Fahrenheit • degrees Fahrenheit
⇨ 7536 Fahrenheit • 7800 Fahrenheit • 7800° Fahrenheit • Daniel Gabriel Fahrenheit • Degrees Fahrenheit • Fahrenheit (1994 video game) • Fahrenheit (Chilean band) • Fahrenheit (Fahrenheit album) • Fahrenheit (SA band) • Fahrenheit (Taiwanese band) • Fahrenheit (Thai band) • Fahrenheit (Toto album) • Fahrenheit (comics) • Fahrenheit (crater) • Fahrenheit (degree) • Fahrenheit (disambiguation) • Fahrenheit (roller coaster) • Fahrenheit (video game) • Fahrenheit 212 • Fahrenheit 451 • Fahrenheit 451 (1966 film) • Fahrenheit 451 (computer game) • Fahrenheit 451 (disambiguation) • Fahrenheit 451 Books • Fahrenheit 56K • Fahrenheit 9-11 • Fahrenheit 9/11 • Fahrenheit 9/11 1/2 • Fahrenheit 9/11 controversy • Fahrenheit 9/11½ • Fahrenheit 932 • Fahrenheit Fair Enough • Fahrenheit degree • Fahrenheit filmography • Fahrenheit graphics API • Fahrenheit hydrometer • Fahrenheit scale • Fahrenheit scale of temperature • Fondly Fahrenheit • Ours (Fahrenheit album) • Songs and Artists That Inspired Fahrenheit 9/11 • Two-Sided Fahrenheit
Wikipedia
Fahrenheit is the temperature scale proposed in 1724 by, and named after, the German physicist Daniel Gabriel Fahrenheit (1686–1736).[1] Within this scale, the freezing of water into ice is defined at 32 degrees, while the boiling point of water is defined to be 212 degrees. The Fahrenheit scale was replaced by the Celsius scale in most countries during the mid to late 20th century,[2] though Canada retains it as a supplementary scale that can be used alongside Celsius.[3][4][5][6] Fahrenheit remains the official scale of the United States, Cayman Islands and Belize.[7] The Rankine temperature scale was based upon the Fahrenheit temperature scale, with its zero representing absolute zero instead.
Contents |
from Fahrenheit | to Fahrenheit | |
---|---|---|
Celsius | [°C] = ([°F] − 32) × 5⁄9 | [°F] = [°C] × 9⁄5 + 32 |
Kelvin | [K] = ([°F] + 459.67) × 5⁄9 | [°F] = [K] × 9⁄5 − 459.67 |
Rankine | [°R] = [°F] + 459.67 | [°F] = [°R] − 459.67 |
For temperature intervals rather than specific temperatures, 1 °F = 1 °R = 5⁄9 °C = 5⁄9 K Comparisons among various temperature scales |
On the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point 212 °F (at standard atmospheric pressure). This puts the boiling and freezing points of water exactly 180 degrees apart.[8] Therefore, a degree on the Fahrenheit scale is 1⁄180 of the interval between the freezing point and the boiling point. On the Celsius scale, the freezing and boiling points of water are 100 degrees apart. A temperature interval of 1 °F is equal to an interval of 5⁄9 degrees Celsius. The Fahrenheit and Celsius scales intersect at −40° (−40 °F and −40 °C represent the same temperature).
Absolute zero is defined as −273.15 °C or −459.67 °F. The Rankine temperature scale was created to use degree intervals the same size as those of the Fahrenheit scale, such that a temperature difference of one degree Rankine (1 °R) is equal to a difference of 1 °F, except that absolute zero is 0 °R – the same way that the Kelvin temperature scale matches the Celsius scale, except that absolute zero is 0 K.[8] The Fahrenheit scale uses (in the same manner as the later Celsius scale) the symbol ° to denote a point on the temperature scale and the letter F to indicate the use of the Fahrenheit scale (e.g. "Gallium melts at 85.5763 °F"),[9] as well as to denote a difference between temperatures or an uncertainty in temperature (e.g. "The output of the heat exchanger experiences an increase of 72 °F" and "Our standard uncertainty is ±5 °F").
According to an article Fahrenheit wrote in 1724, he based his scale on three reference points of temperature.[8] In his initial scale (which is not the final Fahrenheit scale), the zero point is determined by placing the thermometer in brine: he used a mixture of ice, water, and ammonium chloride, a salt, at a 1:1:1 ratio. This is a frigorific mixture which stabilizes its temperature automatically: that stable temperature was defined as 0 °F (−17.78 °C). The second point, at 32 degrees, was a mixture of ice and water without the ammonium chloride at a 1:1 ratio. The third point, 96 degrees, was approximately the human body temperature, then called "blood-heat".[10]
According to a letter Fahrenheit wrote to his friend Herman Boerhaave,[11] his scale was built on the work of Ole Rømer, whom he had met earlier. In Rømer's 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 four in order to eliminate fractions and increase the granularity of the scale. 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 six times (since 64 is 2 to the sixth power).[10][12]
Fahrenheit observed that water boils at about 212 degrees using this scale. Later, other scientists decided to redefine the degree slightly to make the freezing point exactly 32 °F, and the boiling point exactly 212 °F or 180 degrees higher.[citation needed] It is for this reason that normal human body temperature is approximately 98° (oral temperature) on the revised scale (whereas it was 90° on Fahrenheit's multiplication of Rømer, and 96° on his original scale).[13]
The Fahrenheit scale was the primary temperature standard for climatic, industrial and medical purposes in English-speaking countries until the 1960s. In the late 1960s and 1970s, the Celsius scale (known until 1948 as centigrade) replaced Fahrenheit in many countries, typically during their metrication process.[14]
Fahrenheit is used in the United States, Belize, and the United States territories of Puerto Rico, Guam and the U.S. Virgin Islands[7] for everyday applications. For example, U.S. weather forecasts, food cooking, and freezing temperatures are typically given in degrees Fahrenheit. Scientists, such as meteorologists, use Celsius or Kelvin in all countries.[15] In some nations, both measures are quoted.[16]
Various reasons are given[who?] for the resistance to the Celsius system in the U.S., including the larger size of each degree Celsius (resulting in the need for decimals where integer Fahrenheit degrees were adequate for much non-technical work).[citation needed] Another reason is the lower zero point in the Fahrenheit system which reduces the number of negative signs when measurements such as weather data were averaged.[17]
In some countries, Fahrenheit may be used in daily life alongside Celsius. For example, Canada has passed legislation favouring the International System of Units, while also maintaining legal definitions for traditional Canadian imperial units.[18] Canadian weather reports are conveyed using degrees Celsius with occasional reference to Fahrenheit especially for trans border broadcasts. Virtually all Canadian ovens make legal use of the Fahrenheit scale.[19] Thermometers, both digital and analogue, sold in Canada usually employ both the Celsius and Fahrenheit scales.[20][21][22]
Fahrenheit is also utilized in the United Kingdom alongside Celsius. Weather reports displayed in newspapers and online quote temperatures in both Celsius and Fahrenheit (or have an option to enable this), especially during record-breaking weather.[23] However, TV weather reports are primarily conveyed using degrees Celsius. Cooking instructions on most packaged food also list dual temperature scales along with digital/analogue thermometers.
The Fahrenheit symbol has its own Unicode character: "℉"(U+2109). This is a compatibility character encoded for roundtrip compatibility with legacy CJK encodings (which included it to conform to layout in square ideographic character cells) and vertical layout. Use of compatibility characters is discouraged by the Unicode Consortium. The ordinary degree sign (U+00B0) followed by the Latin letter F ("°F") is thus the preferred way of recording the symbol for degree Fahrenheit.
Look up fahrenheit in Wiktionary, the free dictionary. |
|
Contenu de sensagent
dictionnaire et traducteur pour sites web
Alexandria
Une fenêtre (pop-into) d'information (contenu principal de Sensagent) est invoquée un double-clic sur n'importe quel mot de votre page web. LA fenêtre fournit des explications et des traductions contextuelles, c'est-à-dire sans obliger votre visiteur à quitter votre page web !
Essayer ici, télécharger le code;
SensagentBox
Avec la boîte de recherches Sensagent, les visiteurs de votre site peuvent également accéder à une information de référence pertinente parmi plus de 5 millions de pages web indexées sur Sensagent.com. Vous pouvez Choisir la taille qui convient le mieux à votre site et adapter la charte graphique.
Solution commerce électronique
Augmenter le contenu de votre site
Ajouter de nouveaux contenus Add à votre site depuis Sensagent par XML.
Parcourir les produits et les annonces
Obtenir des informations en XML pour filtrer le meilleur contenu.
Indexer des images et définir des méta-données
Fixer la signification de chaque méta-donnée (multilingue).
Renseignements suite à un email de description de votre projet.
Jeux de lettres
Les jeux de lettre français sont :
○ Anagrammes
○ jokers, mots-croisés
○ Lettris
○ Boggle.
Lettris
Lettris est un jeu de lettres gravitationnelles proche de Tetris. Chaque lettre qui apparaît descend ; il faut placer les lettres de telle manière que des mots se forment (gauche, droit, haut et bas) et que de la place soit libérée.
boggle
Il s'agit en 3 minutes de trouver le plus grand nombre de mots possibles de trois lettres et plus dans une grille de 16 lettres. Il est aussi possible de jouer avec la grille de 25 cases. Les lettres doivent être adjacentes et les mots les plus longs sont les meilleurs. Participer au concours et enregistrer votre nom dans la liste de meilleurs joueurs ! Jouer
Dictionnaire de la langue française
Principales Références
La plupart des définitions du français sont proposées par SenseGates et comportent un approfondissement avec Littré et plusieurs auteurs techniques spécialisés.
Le dictionnaire des synonymes est surtout dérivé du dictionnaire intégral (TID).
L'encyclopédie française bénéficie de la licence Wikipedia (GNU).
Copyright
Les jeux de lettres anagramme, mot-croisé, joker, Lettris et Boggle sont proposés par Memodata.
Le service web Alexandria est motorisé par Memodata pour faciliter les recherches sur Ebay.
La SensagentBox est offerte par sensAgent.
Traduction
Changer la langue cible pour obtenir des traductions.
Astuce: parcourir les champs sémantiques du dictionnaire analogique en plusieurs langues pour mieux apprendre avec sensagent.
calculé en 0,436s