The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The...

JAMB 1984

The lower and upper fixed points marked on a mecury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?

A. 55.3^oC
B. 23.3^oC
C. 49.0^oC
D. 16.1^oC
E. 76.7^oC

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Correct Answer: Option B

Explanation

210mm .... 100^oC

49mm .... \(\theta\)

0mm .... 0^oC

\(\frac{49 - 0}{210 - 0}\) = \(\frac{\theta - 0}{100 - 0}\)

\(\frac{49}{210}\) = \(\frac{\theta}{100}\)

\(\theta\) = 23.3^oC

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