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  4. In a mercury thermometer, the ice point (lower fixed point) is marked as 10° and the steam point (upper fixed point) is marked as 130°. At 40° C temperature, what will this thermometer read?

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Q. In a mercury thermometer, the ice point (lower fixed point) is marked as $10^{\circ}$ and the steam point (upper fixed point) is marked as $130^{\circ}$. At $40^{\circ} C$ temperature, what will this thermometer read?

WBJEEWBJEE 2012Thermal Properties of Matter

Solution:

$\frac{x-10}{130-10}=\frac{40}{100}$
$100 x-1000=4800$
$100 x=5800$
$x=58^{\circ}$