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November 21, 2008

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Temperature

Systems of Measurement
Below, the different systems of temperature measurement are compared:

Fahrenheit (°F), Celsius (°C), Réaumur (°r), Kelvin (K) and Rankine (°R).

Formulas

	°C = (°F - 32) ÷ 1.8
	°F = (°C × 1.8) + 32
	K = (°F + 459.67) ÷ 1.8
	K = °C + 273.15

	K = (°r × 1.25) + 273.15
	K = °R ÷ 1.8
	°F = (K × 1.8) - 459.67
	°C = K - 273.15

Temperature Scale Ranges

	Scale Factor	°F	°C	°Réaumur	K	°Rankine
a	Boiling point of water at 1 atmosphere	212	100	80	373.15	671.67
b	Freezing point of water at 1 atmosphere	32	0	0	273.15	491.67
c	Absolute zero	-459.67	-273.15	-218.52	0	0

Different Systems of Temperature Measurement