Question

The distance between the lower and upper fixed points of a Fahrenheit thermometer is 90 mm. If mercury rises 30 mm above the lower fixed point, then find the corresponding temperature.

• A. ${65}^{\circ }F$
• B. ${92}^{\circ }F$
• C. ${62}^{\circ }F$
• D. ${60}^{\circ }F$

Answer 1

The correct option is B ${92}^{\circ }F$

The scale has 90mm for a temperature difference of ${180}^o$.
$\therefore$ 30 mm corresponds to a rise of ${60}^{o}F$
$\therefore$ Final temperature$={32}^o+{60}^o={92}^{o}F$