Astudent collected the above data for this experiment. what error did he make? explain.

The mass did not change after adding water, but it should have increased.

The electronic mass balance may not have been tared properly.

The student may have misrecorded data.

the volume increases

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.