Measurement and Control Basics Fourth Edition

Chapter 7 - Temperature Measurement: Temperature Scales

It has been experimentally determined that the lowest possible temperature
is -273.15°C. The Kelvin temperature scale was chosen so that its zero
is at -273.15°C, and the size of one Kelvin unit was the same as the Celsius
degree. Kelvin temperature is given by the following formula:

 T = T(°C) + 273.15(7-1)

Another scale, the Rankine scale (°R) is defined in the same way-with
-273.15°C as its zero-and is simply the Fahrenheit equivalent of the
Kelvin scale. It was named after an early pioneer in the field of thermodynamics,
W. J. M. Rankine. The conversion equations for the other three
modern temperature scales are as follows:

 (7-2)
 (7-3)
 (7-4)

You can use these equations to convert from one temperature scale to
another, as illustrated in Examples 7-1 and 7-2.

EXAMPLE 7-1

Problem: Express a temperature of 125°C in (a) degrees °F and (b) Kelvin.

Solution: (a) Convert to degrees Fahrenheit as follows:

(b) Convert to Kelvin as follows:

 

 

 

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