The higher and lower fixed points on a thermometer are separated by 160 mm. When the length of the mercury thread above the lower point is 40 mm, the temperature reading would be?
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The thermometer has upper fixed point(UFP) at 160mm and let the lower fixed point be at 0mm thus the distance of separation is maintained of 160mm.
New fixed point(P) is 40mm thus we can find the temperature by using the formulae of (P - LFP)/(UFP - LFP) = C/100 (where C is the temperature).
(40 - 0)/(160 - 0) = C/100.
40/160 = C/100.
1/4 = C/100 Hence, C= 25 degree celsius.
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