does objects lose mass .if yes then what is the definition for mass,if no then what happens during fusion?

Question

i want to know the correct definition for mass in basis of neuclear reaction in losing mass into energy?

Answer 1

Of course they do. In the fusion of hydrogen into helium, the finished product has less mass than the components that went into it. The energy given off by the reaction is related to the loss of mass by the famous equation.

Answer 2

Mass is energy and energy is given off during fusion, so yes it loses mass, but not enough to measure. You gotta believe. Remember what Einstein said: "E equals emcee squared."

Answer 3

Einstein baby! E = m*C^2

The total energy of a body is equal to its weight times the speed of light squared.
In Nuclear reactions atomic scale weight is converted into energy according to Einstein's equation.

speed of light is 3 x 10^8 m/s in a vacuum
energy in joules
mass in kg.

Answer 4

Are you talking about the chemical mass of an element? Or an atom? Compounds can be broken apart... or altered.