What is the role of an electron in an atom

Electrons give negative charge to the atom, and it balances out the positive charge given by the protons. That's the role of an electron!

Hope this helps!

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .