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Réaumur

Conversão de graus Réaumur[1]
Conversão de para Fórmula
Fahrenheit Réaumur °Ré = (°F - 32) × 4/9
Réaumur Fahrenheit °F = °Ré × 9/4 + 32
Kelvin Réaumur °Ré = (K - 273,15) × 4/5
Réaumur Kelvin K = °Ré × 5/4 + 273,15
Celsius Réaumur °Ré = °C × 4/5
Réaumur Celsius °C = °Ré × 5/4
Rankine Réaumur °Ré = (°Ra - 491,67) × 4/9
Réaumur Rankine °Ra = °Ré × 9/4 + 491,67
Newton Réaumur °Ré = °N × 80/33
Réaumur Newton °N = °Ré × 33/80

A escala Réaumur (símbolo: °, °Re, °R) é uma escala de temperatura proposta em 1730 pelo físico e inventor francês René-Antoine Ferchault de Réaumur, cujos pontos fixos são o ponto de congelamento da água (0°Ré) e seu ponto de ebulição (80°Ré).[2][3] Assim, a unidade desta escala, o grau Réaumur, vale 5/4 de 1 grau Celsius e a escala tem o mesmo zero que a escala Celsius.

O termômetro contem álcool diluído e foi construído sob o princípio de tomar o ponto de congelamento da água como zero. A graduação do tubo foi feita em graus nos quais cada um deles era um milésimo do volume contido no bulbo. Réaumur escolheu o álcool em vez do mercúrio, alegando que esse se expandiu de forma mais visível, mas essa escolha provocou problemas, pois seus termômetros originais eram muito volumosos, e o baixo ponto de ebulição do álcool os fez impróprios para muitas aplicações.

Conversão de unidades de temperatura

Fórmulas de conversão de temperaturas em kelvin
Conversão de para Fórmula
kelvin grau Fahrenheit °F = K × 1,8 - 459,889
grau Fahrenheit kelvin K = (°F + 459,67) / 1,8
kelvin grau Celsius °C = K - 273,15
grau Celsius kelvin K = °C + 273,15
kelvin rankine °Ra = K × 1,8
rankine kelvin K = °Ra / 1,8
kelvin réaumur °Ré = (K - 273,15) × 0,8
réaumur kelvin K = °Ré × 1,25 + 273,15

Retas de Conversão de Temperatura

Referências

  1. «Conversor de unidades de medição». Thomas Hainke 
  2. Simons, Paul (17 de outubro de 2007). «How Reaumur fell off the temperature scale». The Times. Consultado em 10 de março de 2008 
  3. «Temperature scales». The University of Maine 

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