Scales of thermometery

Scales of thermometery

There are three scales of thermometery which are used for temperature messurements. 

Centigrade scale:

                            It has a zero mark for the temperature of ice at one atmosphere pressure. The mark 100 c° indicates the temperature of boiling water at 1 atmospheric pressure. The space between these temperature marks is divided into 100 equal parts and each parts is 1° c.

 Fahrenheit scale:

                              The melting point of ice at 1 atmospheric pressure has a mark 32°f and that of boiling water is 212°f. The space between these temperature marks is divided into 180 equal parts and each part is 1 F.

 Absolute or kelvin scale:

                                         Pressure is 273K. The water boils at 373K or more precisely at 373.16K. Temperature on kelvin scale= Te mperature C+273.16 .

Following relationships help us to understand the interconversion of various scales of temperature.

 K=° c + 273.16 
°c = 5/9[° f-32]
°f,= 9/5 (°c) + 32