The higher and lower fixed points on a thermometer are separated by 150mm. when the length
of the mercury thread above the lower temperature is 30mm.the temperature reading would
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The thermometer has upper fixed point (UFP) at 150mm and let the lower fixed point be at 0mm thus the distance of separation is maintained of 150mm.
New fixed point(P) is 30mm thus we can find the temperature by using the formula of
(UFP−LFP)
(P−LFP)
=C/100
(where C is the temperature).
(30-0) /(150−0)= C/100
30/150=C/100
1/5=C/100
Hence, C=25 0 C,
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