Question

A constant pressure air thermometer gave a reading of $47.5$ units of volume when immersed in ice cold water, and $67$ units in a boiling liquid. The boiling point of the liquid will be

• A. ${112}^{\circ }C$
• B. ${100}^{\circ }C$
• C. ${135}^{\circ }C$
• D. ${125}^{\circ }C$

Answer 1

The correct option is A ${112}^{\circ }C$

We know that:$\frac{V}{T}=$ constant

Given:$V_1=47.5$ units, $V_2=67$ units $T_1=0+273=273K$

By charles law
At constant pressure volume is directly proportional to temperature

$\frac{V}{T}$= constant

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

$\frac{47.5}{(0+273)}=\frac{67}{(T+273)}$

$T={112}^{\circ }C$
Final answer (c)