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 ].