Question

The absolute temperature value that corresponds to $27{}^{\circ }C$ is:
A. 200 K
B. 300 K
C. 400 K
D. 246 K

Answer 1

Hint: Absolute zero is the possible coldest temperature of a substance where no heat remains in the substance. There are two types of scale to measure temperature, Rankine scale and Kelvin Scale. Most widely used scale is the Kelvin scale.
- The definition of kelvin states that it is a thermodynamic temperature of the fraction 1/273.1 of the thermodynamic temperature of the triple point of water. The Kelvin scale measures the temperature in the form of degree Celsius and we do not write degrees after writing the Kelvin, therefore, we need to change that sometimes.

Complete Solution :
 At the absolute zero temperature, the movement of the molecules becomes zero as they don’t have energy to move because there is no heat and kinetic energy of the molecules also becomes zero. According to the definition stated above and, in this question, we need to calculate the value of $27{}^{\circ }C$ in Kelvin. In the Kelvin scale,
$K={....}^{{}^{\circ }}C+273$
- You just need to enter the value in this formula and 273.1 is rounded off to 273 to make it easier.
$\Rightarrow {27}^{{}^{\circ }}C+273K=300K$
So, the correct answer is “Option B”.

Note: If at some time the temperature is given in Kelvin and you need to find it in Celsius then, you can just subtract 273 from that value and you will get the temperature in Celsius degree.