Question

The steam point and the ice point of a mercury thermometer are marked as ${80}^o$ and ${20}^o$. What will be the temperature in centigrade mercury scale when this thermometer reads ${32}^o$

• A. ${20}^o$
• B. ${30}^o$
• C. ${10}^o$
• D. $0^o$

Answer 1

The correct option is A ${20}^o$

From the relation:

$\frac{T-20}{80-20}=\frac{T_c}{100}$

where,

$T_c$ is temperature in centigrate scale

$T$ is the temperature measured by mercury thermometer and gives to be 32 degree

$\frac{32-20}{80-20}=\frac{T_c}{100}$

$T_c=20°$