Question

What is the boiling point of water on Kelvin scale? Convert it into centigrade scale.

Answer 1

Hint: The Kelvin scale is based absolute zero below that, temperature not exists. And for centigrade scale temperature is different for boiling point and freezing point. To convert temperature from Kelvin scale to Centigrade scale a formula is used:
i.e., ${\rm{ Kelvin}} = ^\circ {\rm{Celsius}} + 273$

Complete step-by-step solution:
To solve this question, we have to first understand about the concept of boiling point. The point at which the pressure exerted by the surrounding in a liquid is equal to the pressure exerted by the vapour of the liquid or in other words we can say the point at which the liquid is converted to vapour before the temperature raise is termed the boiling point of that substance. With the increase of temperature, the vapour pressure is exerted into the space the result of which vapour pressure get increased. At the boiling point, within the liquid the bubbles start forming and rise to the surface. According to the pressure applied, the boiling point varies. The boiling points of liquid are measured either in Celsius or in Fahrenheit. The boiling point of water in Kelvin scale is ${\rm{373}}.{\rm{2 K}}$.

To convert this Kelvin scale into centigrade scale;
$\begin{array}{c}{\rm{ Kelvin}} = ^\circ {\rm{Celsius}} + 273\\373 = ^\circ {\rm{Celsius}} + 273\\^\circ {\rm{Celsius}} = 373 - 273 = 100\end{array}$

Therefore, boiling point of water in centigrade scale is ${\rm{1}}00$.

Note: According to the Fahrenheit scale, boiling point of water is ${\rm{212}}$ degree Fahrenheit and freezes at ${\rm{32}}$ degree Fahrenheit. For Celsius scale, water boils and ${\rm{1}}00$ degree Celsius and freezes at $0$ degree Celsius. The conversion of Celsius scale to Fahrenheit scale follows the formula $\left( {0^\circ {\rm{C}}\; \times \dfrac{{\rm{9}}}{5}} \right) + {\rm{32}} = {\rm{32}}^\circ {\rm{F}}$.