Question

What is fusion?

Answer 1

Fusion:

1. When two atoms meet, they fuse to form a heavier atom. Example: Two hydrogen atoms combine to form one helium atom.
2. This occurs when the internal energy of a solid increases, usually as a result of the application of heat or pressure, raising the temperature of the substance to the melting point.

Example:

Helium may be created by fusing hydrogen and hydrogen.