where a and b are constants for the pair of metals . Unknown temperature of hot junction when cold junction is at 0 ° C .
Where E100 is the thermo-emf when hot junction is at 100 ° C .
A thermo-couple thermometer can measure temperature from — 200 ° C to 1600 ° C .
Thermal Equilibrium
When there is no transfer of heat between two bodies in contact , the the bodies are called in thermal equilibrium .
Zeroth Law of Thermodynamics
If two bodies A and B are separately in thermal equilibrium with thirtli body C , then bodies A and B will be in thermal equilibrium with each other .
Triple Point of Water
The values of pressure and temperature at which water coexists inequilibrium in all three states of matter , i . e ., ice , water and vapour
called triple point of water .
Triple point of water is 273 K temperature and 0.46 cm of mere pressure .
Specific Heat
The amount of heat required to raise the temperature of unit mass the substance through 1 ° C is called its specific heat .
It is denoted by c or s .
Its SI unit is joule / kilogram- ° C '( J / kg- ° C ). Its dimensions is [ L 2 T -2 θ -1 ].