If there are 10 minor divisions between two major divisions, one major division representing 1∘C, one minor division will be equal to
When the mercury level coincides with a minor division
When the mercury level coincides with a major division
One major division equals 10 minor division.
∴1 minor division=110×major division∴1 minor division=110(1∘C)So, 1 minor division=0.1∘C
This is called the least count of thermometer.