Question

The correct value of ${0^0}C$ on the Kelvin scale is
A. 273.15 K
B. 273.16 K
C. 273 K
D. 273.2 K

Answer 1

Hint: Here in the question, we need to determine the equivalent value of ${0^0}C$ in Kelvin scale. For this, we will use the formula $K = 273.15 + {}^0C$ for the conversion of degree Celsius to Kelvin and vice versa where ${}^0C$ is the absolute value of the Celsius scale and K is the absolute value in the Kelvin scale.

Complete step by step answer:
The temperature of an object can be measured in different units. Kelvin is the SI unit of the temperature. It is denoted by the letter “K”. Initially, all the measurement and calculations were made on the degree Celsius only but when the Kelvin has been universally accepted as the SI unit of temperature, there established a relation between degree Celsius and the Kelvin as $K = 273.15 + {}^0C$ where 273.15 comes from the freezing point of ice and ${}^0C$ is the absolute value of the Celsius scale.

Now, substituting ${0^0}C$ in the formula $K = 273.15 + {}^0C$ to determine the equivalent Kelvin scale as:

$
  K = 273.15 + 0{}^0C \\
  K = 273.15{\text{ Kelvin}} \\
 $

Hence, we can say that the correct value of ${0^0}C$ on the Kelvin scale is 273.15 Kelvin.

So, the correct answer is “Option A”.

Note:
Students should not get confused with the terms ${0^0}C$ and $273.15K$. These two terms are similar and are written in two different forms only. The freezing point of the ice is ${0^0}C$ which is similar to $273.15K$ in Kelvin scale. Moreover, the sign the values of the temperature should be kept with the sign convention as well.