Cet article explique ce qu'est Fahrenheit et comment convertir entre différentes échelles thermométriques (Fahrenheit, Celsius et Kelvin). De plus, vous trouverez un calculateur en ligne pour convertir directement n'importe quelle valeur de température.
Que sont les degrés Fahrenheit ?
Le degré Fahrenheit est une unité utilisée pour exprimer les températures. L'échelle Fahrenheit a été inventée par le physicien Daniel Gabriel Fahrenheit en 1724. Les degrés Fahrenheit sont l'unité de température la plus utilisée dans la plupart des pays anglo-saxons et à Porto Rico.
Le symbole pour exprimer une température en degrés Fahrenheit est ºF. Par exemple, si la température est de 75 degrés Fahrenheit, écrivez 75 ºF.
Gardez à l’esprit que la mesure la plus utilisée en ingénierie pour exprimer les températures n’est pas le degré Fahrenheit mais le kelvin, puisqu’il s’agit de l’unité du Système International. Et d’un autre côté, l’unité la plus utilisée dans la vie quotidienne est le degré Celsius.
Les températures les plus caractéristiques de l’échelle Fahrenheit sont les suivantes :
- -459,67 ºF : Le zéro absolu de la température, équivalent à 0 K.
- 0ºF : point de fusion de l’eau.
- 98,6 ºF : température normale du corps humain.
- 212ºF : point d’ébullition de l’eau.
Comme vous pouvez le constater, l’échelle Fahrenheit n’est pas entièrement positive, mais il peut également y avoir des degrés Fahrenheit négatifs.
Comment convertir des degrés Fahrenheit en Celsius
Compte tenu de la définition des degrés Fahrenheit, dans cette section nous verrons comment convertir une température exprimée en degrés Fahrenheit en degrés Celsius et vice versa.
Pour convertir une température exprimée en degrés Fahrenheit en degrés Celsius , vous devez soustraire 32 unités de la valeur de température puis diviser par 1,8.
![\definecolor{verd}{HTML}{4FD12F} \newtcbox{\mymath}[1][]{% nobeforeafter, math supérieur, tcbox raise base, amélioré, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \begin{empheq}[box={\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{verd!20!white,} ]}]{equation*} \displaystyle ºC= \cfrac{ºF-32}{1.8} \end{empheq}](https://physigeek.com/wp-content/ql-cache/quicklatex.com-636fd5317527d296e43681f73b7fea74_l3.png "Rendered by QuickLaTeX.com")
Pour que vous puissiez voir comment la valeur d'une température de l'échelle Fahrenheit est convertie en échelle Celsius, vous avez un exemple élaboré ci-dessous :
Pour convertir une température de l'échelle Celsius à l'échelle Fahrenheit , vous devez multiplier la valeur de la température par 1,8 puis ajouter 32 au résultat.
![\definecolor{verd}{HTML}{4FD12F} \newtcbox{\mymath}[1][]{% nobeforeafter, math supérieur, tcbox raise base, amélioré, colframe=verd, boxrule=1pt, boxsep=2mm, #1} \begin{empheq}[box={\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \displaystyle ºF= 1,8\cdot ºC +32 \end{empheq}](https://physigeek.com/wp-content/ql-cache/quicklatex.com-0211046f57f5fad770ae56f5a677fe6d_l3.png "Rendered by QuickLaTeX.com")
Par exemple, la conversion de 150 ºC en degrés Fahrenheit se fait comme suit :
Comment convertir les degrés Fahrenheit en Kelvin
Nous venons de voir comment une température est convertie de degrés Fahrenheit en degrés Celsius, cependant, l'échelle Kelvin est également largement utilisée, notamment en physique et en ingénierie. Ainsi dans cette section nous verrons comment passer des degrés Fahrenheit à Kelvin et vice versa, puisque le calcul n'est pas aussi direct que sur l'échelle Celsius.
Pour convertir des degrés Fahrenheit en kelvins, il vous suffit de substituer la valeur de température exprimée en degrés Fahrenheit dans la formule suivante et d'effectuer les calculs :
![\definecolor{green}{HTML}{4FD12F} \newtcbox{\mymath}[1][]{% nobeforeafter, math supérieur, tcbox raise base, amélioré, colframe=green, boxrule=1pt, boxsep=2mm, #1} \begin{empheq}[box={\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \displaystyle K= \cfrac{ºF-32}{1.8}+273.15 \end{empheq}](https://physigeek.com/wp-content/ql-cache/quicklatex.com-a72e06ad173ec60d80305e646ff239cf_l3.png "Rendered by QuickLaTeX.com")
Pour que vous puissiez voir comment la valeur d'une température passe entre ces deux mesures, un exemple a été résolu :
Pour faire l’étape inverse, c’est-à-dire convertir une température de l’échelle Kelvin à l’échelle Fahrenheit, vous devez appliquer la formule suivante :
![\definecolor{green}{HTML}{4FD12F} \newtcbox{\mymath}[1][]{% nobeforeafter, math supérieur, tcbox raise base, amélioré, colframe=green, boxrule=1pt, boxsep=2mm, #1} \begin{empheq}[box={\mymath[colback=white, shadow={2mm}{-2mm}{0mm}{green!20!white,} ]}]{equation*} \displaystyle ºF= 1,8\cdot (K-273.15)+32 \end{empheq}](https://physigeek.com/wp-content/ql-cache/quicklatex.com-c74090ede011f02153708b0731ea4e0c_l3.png "Rendered by QuickLaTeX.com")
Par exemple, la conversion de 450 K en degrés Fahrenheit se fait comme suit :
Calculatrice de conversion Fahrenheit en Celsius et Kelvin
Afin que vous puissiez convertir plus rapidement entre différentes unités de température, le convertisseur en ligne suivant a été créé avec lequel vous pouvez convertir une valeur de température entre les échelles thermométriques Fahrenheit, Celsius et Kelvin.
Pour utiliser la calculatrice, vous devez sélectionner les unités de la température saisie et écrire sa valeur en utilisant le point (.) comme séparateur décimal.
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