Why is it important to keep the temperature and the amount of water the same when testing surface area?

It is important that the temperature of the water is maintained in testing the surface area because as we know, when water is heated, it expands. Thus, the measured or tested surface area may be an overestimation. The same is true for the amount of water should be kept constant as well because an additional water will also cause overestimation. 

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .