Question

Why is the Kelvin scale of temperature better than Celsius scale of temperature?

Answer 1

Hint: To measure the temperature both the values are correct from their prospective.
But if we compare both the scales one is considered that is The Kelvin temperature scale as the SI unit. We will here see the advantages of Kelvin Scale over the Celsius scale.

Complete answer:
What is the first unit or degree of measurement that comes to our mind when we talk about temperature? It is always degree Celsius or degree Centigrade. But, when we see it from the perspective of science, Kelvin is the most preferred unit of temperature.
Kelvin scale is an absolute zero temperature scale and the minimum temperature that it can have is $0K$.Thus Kelvin scale does not give any negative values. This makes Kelvin scale to be convenient for use.
A Celsius scale defines the temperature with reference to the freezing or melting point of water which is ${0^ \circ }C$at a pressure of $1bar$. As temperatures below ${0^ \circ }C$are quite possible i.e., a thermodynamic system can have lowest or minimum energy at a temperature below ${0^ \circ }C$hence a ${0^ \circ }C$temperature in the Celsius scale does not define it to be absolute temperature. Thus, Celsius scale cannot be considered as an absolute scale instead it can be called a relative scale. Thus, below ${0^ \circ }C$ Celsius scale gives negative values of temperature.
Using the Kelvin scale of temperature, it becomes easy to represent many fundamental laws and their mathematical equations.
The Kelvin temperature scale is an absolute temperature scale with zero at absolute zero. Because it is an absolute scale, measurements made using the Kelvin scale do not have degrees.
Thus, keeping the concept of absolute temperature in mind we may say that the Kelvin scale is better than the Celsius scale of temperature.

Note:
Kelvin temperature scale is considered as the SI unit of temperature.
But we should keep in mind that everywhere we cannot use the same temperature scale while solving a problem we should know how to convert each other.
Thermometers are never marked in the kelvin scale.