Question

A substance shows a rise in temperature of $18{}^{\circ }C$ on a celsius scale. What would be the corresponding rise in temperature on a Kelvin scale?

• A. $18K$
• B. $31K$
• C. $29.3K$
• D. $73.2K$

Answer 1

The correct option is A $18K$

Let initial temperature in celcius scale be $T_{ci}$
Let final temperature in celcius scale be $T_{cf}$
Let initial temperature in kelvin scale be $T_{ki}$
Let final temperature in kelvin scale be $T_{kf}$

Temperature in Kelvin scale = Temperature in degree celsius + 273.

Hence,
$T_{ci}=T_{ki}+273$
$T_{cf}=T_{kf}+273$
$⟹T_{cf}-T_{ci}=T_{kf}-T_{ki}$
$T_{kf}-T_{ki}=18$