Atomic mass can change through the process of fusion. Another way is, it can also change in nuclear fusion.
Power used by the clock=1.03 W
Explanation:
resistance= 14000 ohm
voltage=120 V
The formula for the power is given by

P=(120)²/14000
P=1.03 W
Well, the density of the water is

so i believe that is what the question is asking for :)
<span>Rising or falling, it does not change.</span>