What are the differences between weight and mass?

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The mass is an intrinsic property of matter, the mass is invariant when moving the body in the Universe.

The weight is the acceleration that a particle suffers due to its mass, multiplied by that acceleration. In general relativity it is not a vector, except for an approximation when gravitational potentials change little, because the masses that attract them are small. Obviously the acceleration that suffers by the rest of the forces: electric, nuclear, causes that the acceleration of the particle many times is not that determines the gravitational field

In fact gravity is the weakest force, what happens is that the coupling constant (as it affects the field at a point to the particle, for example, the electric field coupling constant is the charge, a particle in a field All the constant of coupling between particles can be negative and positive, except the mass, which is always positive and 2 masses are always attracted, so that they tend to be positive, if it is positive it carries the acceleration in the direction of the field and proportional to its load. To form stable structures that balance and are not usually observed, except for, for example, electric, in electrical appliances, such as old bulbs, such as modern electronic devices: mobiles, computers, etc ...

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