Temperature scales - thermodynamics, Mechanical Engineering

Temperature Scales:

The temperature of a system can be determined by bringing a 2nd body, a thermometer, into contact with the system and allowing thermal equilibrium to be reached. The value of temperature is found by measuring some temperature dependent property of thermometer. Any such property is called as thermometric property.

To allocate numerical values to the thermal state of the system, it is required to establish a temperature scale on which temperature of system can be read. This requires selection of basic unit and reference state. Thus, the temperature scale can be established by assigning numerical values to certain easily reproducible states. For this purpose it is probable to use the following 2 fixed points:

(1) Ice Point: It is equilibrium temperature of ice having air saturated water at standard Atmospheric pressure.

(2) Steam Point: The equilibrium temp. of pure water having its own vapour of standard atmospheric pressure.

 

SCALE

ICE POINT

STEAM POINT

TRIPLE POINT

KELVIN

273.15K

373.15K

273.15K

RANKINE

491.67R

671.67R

491.69R

FAHRENHEIT

320F

2120F

32.020F

CENTIGRADE

00C

1000C

0.010C

463_Temperature Scales.png

Compansion of references on different scales

 

Posted Date: 10/15/2012 2:05:12 AM | Location : United States







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