Heat and temperature 

Defining scale of temperature :

We are now in   In a position to say whether to give bodies at the same temperature or not if they are not at the same temperature we also know which is the highest temperature and who is is the lowest temperature .our next task is to difine a scale of temperature.so thatwe can give a numerical value to the temperature of a body .To do this we came chose a subtence and look for a measurable property of the substance and look for measurable property of the subtence wgich monotonically changes with temperature.The temperature can then be difined as a chosen function of this property.As a example length of the Magaly Kalamtake a mass of murcury in a glass bulb terminating in along capillary.The length of the Murcury column in the Cappelletti changes with that temperature.each lengthcorresponding to a particular temperature of how the mercury.how can we assign in numerical value correspond to an observed length of the Mercury column?
       The earlier method was to choose two fixed points of temperature which can be easily reproduced in laboratory.The temperature of ice melting at 1atm(called ice point);