Celsius, Farenheit and Kelvin Temperature Scales
المؤلف:
Professor John W. Norbury
المصدر:
ELEMENTARY MECHANICS & THERMODYNAMICS
الجزء والصفحة:
p 212
30-12-2016
2032
Celsius, Farenheit and Kelvin Temperature Scales
The antiquated Farenheit temperature scale is only still used in a few countries (including the United States). Water freezes at 32oF and boils at 212oF. A much more natural temperature scale, called Celsius or Centigrade, rates the freezing and boiling point of water at 0oC and 100oC respectively. To convert between the two scales use
where F is the temperature in Farenheit and C is the temperature in Centigrade.
Example If you set your house thermo state to 70oF what is the temperature in Centigrade ?
Solution
Example At what temperature are the Farenheit and Centigrade scales equal ?
Solution When they are equal the F = C = x giving
i.e.
The temperature of a substance is related to the speed of the individual molecules which also give rise to pressure. Thus a gas which has fast moving molecules will have a high temperature and pressure. What happens if we slow all the molecules to zero speed? Well then the gas pressure will be zero. The temperature at which this happens is -273:15oC. This leads to a third type of tmperature scale called Absolute temperature or Kelvin temperature. The Kelvin temperature at which a gas has zero pressure is defined to be 0oK. Thus
where C is the temperature in Centigrade and K is the temperature in Kelvin.
Example What is the relationship between Farenheit and Kelvin?
Solution
and
giving
or
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