Question

Convert the following Celsius temperature to kelvin scale.
A. $-273{}^\circ C$
B. $30{}^\circ C$
C. $-100{}^\circ C$
D. $-40{}^\circ C$

Answer 1

Hint: Temperature tells us about how cold and hot an object is. We can say that the temperature is related to kinetic energy of particles. If the kinetic energy is high then the temperature will also increase.
On the Kelvin scale, temperatures are much colder than the freezing point of ice on the centigrade.

Formula used:
$K={}^\circ C+273$
where, $K$ is the temperature in Kelvin and ${}^\circ C$ is the degree Celsius

Complete step by step answer:
Mostly, Celsius scale is used to calculate a unit of temperature. It is also called a centigrade scale. It is denoted with the symbol $({}^\circ C)$ . In this scale, specific temperatures were given that indicate a difference between two temperatures.
But in thermodynamics, the Kelvin scale is used to calculate the temperature. It is denoted with the symbol $K$ . Zero Kelvin is also known as absolute zero. At zero Kelvin, there will be no decrease in the average kinetic energy of the particles.
Now, let us see how to convert a Celsius scale into Kelvin.
To convert a Celsius scale into Kelvin, we add $273$ to the temperature value in Celsius.
To calculate Kelvin scale for $0{}^\circ C$
$K={}^\circ C+273$
where, $K$ is the temperature in Kelvin and ${}^\circ C$ is the degree Celsius.
$K=0+273=273K$
Now let us convert the options given in the question.
A. $-273{}^\circ C$
Now, substituting the given value in the formula, we get,
$K=-273+273$
$\Rightarrow K=0K$
All the other three parts can also be converted similarly
B. $30{}^\circ C$
$K=273+30$
$\Rightarrow K=303K$
lets see the next option,
C. $-100{}^\circ C$
$K=-100+273$
$\Rightarrow K=173K$
lets see the next option,
D. $-40{}^\circ C$
$K=-40+273$
$\Rightarrow K=233K$

Note: To calculate temperature, a thermometer is used. It contains various temperature scales. The most common scales are Celsius scale and Kelvin scale.There are many physical processes that are somehow related to temperature. It includes density, vapor pressure, conductivity, rate of a chemical reaction, solubility and many more.At absolute zero, we cannot remove more energy from a system.