Why has nuclear fusion been difficult to develop?
A. It is hard to recreate the extremely high temperatures and pressures found inside stars.
B. An efficient shape to contain the reaction has not been found.
C. Fusion normally occurs in the vacuum of space and the atmosphere on Earth stops the reaction.
D. Fuel for nuclear fusion is very rare.

c. electrical charges of ionic bonds.

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 .