What is the complete definition of Mass?

Answer 1

Mass is the property of an object to resist movement when a force is applied against it. While it is often measured as weight and the space it occupies as volume; the mass of an object is constant and independent of these two measurements. Mass is considered the force exerted on an object and that force the object exerts on the universe. (The Galilean equivalence principle states these two forces are equal, due to our limited understanding of gravity.)

In a gravitational field the mass is acted upon by the force of gravity (and there is no place in the known universe where the force of gravity doesn't apply). The mass can be measured by its weight, but the weight changes as the gravity field changes an the mass does not. The volume of the object can vary independent of the gravity field, but it is not a measurement of mass since it varies with the temperature. The mass also describes the power due to gravity that the object exerts on other objects. Until we understand gravity better then the power of gravity imparted to an object by its mass equals that of the gravitational power imparted to other objects by that object.

In Einstein’s theory of Special Relativity and particle or quantum physics the mass of an object is the same in all frames of reference.

According to Wikipedia: http://en.wikipedia.org/wiki/Mass
"Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. Mass is a central concept of classical mechanics and related subjects, and there are several forms of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.

In classical mechanics, there are three types of mass or properties called mass:

- Inertial mass is a measure of an object's 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.
- Passive 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 passive gravitational mass experiences a smaller force than an object with a larger passive gravitational mass. (This force is called the weight of the object. In informal usage, the word "weight" is often used synonymously with "mass", because the strength of the gravitational field is roughly constant everywhere on the surface of the Earth. In physics, the two terms are distinct: an object will have a larger weight if it is placed in a stronger gravitational field, but its passive gravitational mass remains unchanged.)
- Active gravitational mass is a measure of the strength of the gravitational field due to a particular object. For example, the gravitational field that one experiences on the Moon is weaker than that of the Earth because the Moon has less active gravitational mass.

Although inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them. This empirical observation leads to the equivalence principle of general relativity. The weak form of the equivalence principle states that this correspondence between inertial and gravitational masses is not accidental, and that no experiment will ever detect a difference between them."

According to Wikipedia: http://en.wikipedia.org/wiki/Invariant_mass
"The invariant mass or intrinsic mass or proper mass or rest mass or just mass is a measurement or calculation of the mass of an object that is the same for all frames of reference. For any frame of reference, the invariant mass may be determined from a calculation involving an object's total energy and momentum."

According to Wikipedia: http://en.wikipedia.org/wiki/Relativistic_mass
“The term mass in special relativity can be used in different ways, occasionally leading to confusion. Historically, mass can refer to either the invariant mass or the relativistic mass.

The invariant mass (also known as the rest mass, intrinsic mass or the proper mass ) is an observer-independent quantity.

The relativistic mass (also known as the apparent mass) depends on one's frame of reference.

In particular, the relativistic mass increases with observed speed while the invariant mass is an invariant property of an object: it does not change with a change of reference system.

For a discussion of mass in General relativity, see mass in General Relativity. For a general discussion including mass in Newtonian mechanics, see Mass.

It has been suggested that Conservation of mass in special relativity be merged into this article or section.”

According to Wikipedia: http://en.wikipedia.org/wiki/Conservation_of_mass
The mass of an object is conserved, at low speeds. However, according to Enstien the weight of an object increases as the speed of that object approces the speed of light.

Answer 2

Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. Mass is a central concept of classical mechanics and related subjects, and there are several forms of mass within the framework of relativistic kinematics (see mass in special relativity and mass in General Relativity). In the theory of relativity, the quantity invariant mass, which in concept is close to the classical idea of mass, does not vary between single observers in different reference frames.

In classical mechanics, there are three types of mass or properties called mass:

Inertial mass is a measure of an object's 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.
Passive 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 passive gravitational mass experiences a smaller force than an object with a larger passive gravitational mass. (This force is called the weight of the object. In informal usage, the word "weight" is often used synonymously with "mass", because the strength of the gravitational field is roughly constant everywhere on the surface of the Earth. In physics, the two terms are distinct: an object will have a larger weight if it is placed in a stronger gravitational field, but its passive gravitational mass remains unchanged.)
Active gravitational mass is a measure of the strength of the gravitational field due to a particular object. For example, the gravitational field that one experiences on the Moon is weaker than that of the Earth because the Moon has less active gravitational mass.
Although inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them. This empirical observation leads to the equivalence principle of general relativity. The weak form of the equivalence principle states that this correspondence between inertial and gravitational masses is not accidental, and that no experiment will ever detect a difference between them.

Answer 3

You asked for the definition of Mass (with a capital letter)
1. Public celebration of the Eucharist in the Roman Catholic Church and some Protestant churches.
2. The sacrament of the Eucharist.

The definition with a small letter - mass;
1. A unified body of matter with no specific shape: a mass of clay.
2. A grouping of individual parts or elements that compose a unified body of unspecified size or quantity: "Take mankind in mass, and for the most part, they seem a mob of unnecessary duplicates" (Herman Melville).
3. A large but nonspecific amount or number: a mass of bruises.
4. The principal part; the majority: the mass of the continent.
5. The physical volume or bulk of a solid body.
6. Abbr. m Physics A property of matter equal to the measure of an object's resistance to changes in either the speed or direction of its motion. The mass of an object is not dependent on gravity and therefore is different from but proportional to its weight.
7. An area of unified light, shade, or color in a painting.
8. Pharmacology A thick, pasty mixture containing drugs from which pills are formed.
9. masses The body of common people or people of low socioeconomic status: "Give me your tired, your poor,/Your huddled masses yearning to breathe free" (Emma Lazarus).

Answer 4

A property of matter equal to the measure of an object's resistance to changes in either the speed or direction of its motion. The mass of an object is not dependent on gravity and therefore is different from but proportional to its weight.

Answer 5

the complete definition of mass is a body of coheret matter, usu. of indeinite shape;2 a collection of incoheret particles, parts, or objects regarded as forming one body ; 3 aggregate; whole: 4. a considerable number or quantity: 5 bulk: massivness: 6 the greater part of something: