It isn't. It's lower. Try counting masses in e.g.:Ciaran H said:why is the mass of the products (the two new nuclei and fission neutrons) greater than the mass of the original nuclei?
Fission is a process in which a heavy atom, such as uranium, splits into two or more smaller atoms, releasing a large amount of energy.
The increase in mass in fission comes from the conversion of nuclear potential energy to mass energy. According to Einstein's famous equation, E=mc^2, energy and mass are equivalent and can be converted into each other.
The increase in mass contributes significantly to the total energy released in fission. In fact, the mass-energy conversion is responsible for the majority of the energy released in a nuclear fission reaction.
No, the increase in mass in fission is not a result of the fusion of atoms. Fission and fusion are two different processes that involve the splitting and combining of atoms, respectively.
The increase in mass in fission cannot be directly observed in a fission reaction. However, its effects can be seen through the release of energy and the production of fission products, which have a slightly lower mass than the original atom.