Mass is a measure of how much force it will take to change that path. ... Weight, on the other hand, is a measure of the amount of downwards force that gravity exerts on an object. This force increases with the object's mass: the more inertia it has, the harder gravity pulls.
In scientific contexts,mass is the amount of "matter" in an object (though "matter" may be difficult to define),where as weight is the force exerted on an object by gravity.
