Question

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?

• A. $78 ^{\circ}$
• B. $66 ^{\circ}$
• C. $62 ^{\circ}$
• D. $58 ^{\circ}$

Answer 1

Answer: (D)

$58 ^{\circ}$

Answer 2

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