[dleviwing]

Brian;
I might suggest that you invest in some physics text books. Your encyclopedia is not very accurate.

What causes mass? Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. It is a central concept of classical mechanics and related subjects.

Strictly speaking, there are two different quantities called mass:
Inertial mass is a measure of an object's inertia or its resistance to changing its state of motion when a force is applied. An object with small inertial mass changes its motion more readily, and an object with large inertial mass does so less readily.

Gravitational mass is a measure of the strength of an object's interaction with the gravitational field. Within the same gravitational field, an object with a smaller gravitational mass experiences a smaller force than an object with a larger gravitational mass. (This quantity is sometimes confused with weight, which is the force experienced by a mass. An object will have a larger weight if it is placed in a stronger gravitational field, but its mass remains unchanged.)

Although inertial and gravitational mass are conceptually distinct, no experiment performed to date has ever managed to find a difference between the two.

Now that we have stated the text book concept, let's look at mass in terms of the absolutes. As an object is accelerated, its mass value increases. This is referred to as Relativistic mass. If mass were truly representative of a quantity of matter, this value would remain constant regardless of motion. What we observe with acceleration of an object is the conversion of the random motion of an object to the uniform motion of a linear accelerated velocity. As we stated earlier, uniform motion allows the Self-affinity bonding property to increase and thus it causes the substance of the object to condense to form an object with greater spatial density and quite likely smaller spatial dimensions. Thus this dose not increase the quantity of matter, only the quantity of uniform motion and results in less random motion. This can also be viewed as causing the random motion wavelengths to reduce and to be confined within a smaller spatial volume.