Mass

The mass of an object is a measure of the amount of matter in a body. A mountain has typically more mass than a rock, for instance. Mass should not be confused with the related but quite different concept of weight. 

We can measure the mass of an object if a force acts on the object. If the mass is greater, the object will have less acceleration (change in its motion). This measure of mass is called inertial mass because it measures inertia.

A large mass like the Earth will attract a small mass like a human being with enough force to keep the human being from floating away. "Mass attraction" is another word for gravity, a force that exists between all matter. When we measure the force of gravity from an object, we can find its gravitational mass. Tests of inertial and gravitational mass show that they are the same or almost the same.

Units of mass 
The unit of mass in the International System of Units is the kilogram, which is represented by the symbol 'kg'. Fractions and multiples of this basic unit include the gram (one thousandth of a kg, symbol 'g') and the tonne (one thousand kg), amongst many others.

In some fields or applications, it is convenient to use different units to simplify the discussions or writings. For instance,
 Atomic physicists deal with the tiny masses of individual atoms and measure them in atomic mass units.
 Jewelers normally work with small jewels and precious stones where masses are traditionally measured in carats, which correspond to 200 mg or 0.2 g.
 The masses of stars are very large and are sometimes expressed in units of solar masses.

Traditional units are still in encountered in some countries: imperial units such as the ounce or the pound were in widespread use within the British Empire. Some of them are still popular in the United States, which also uses units like the short ton (2,000 pounds, 907 kg) and the long ton (2,240 pounds, 1010 kg), not to be confused with the metric ton (1,000 kg).

Conservation of mass and relativity 

Mass is an intrinsic property of the object: it does not depend on its volume, or position in space, for instance. For a long time (at least since the works of Antoine Lavoisier in the second half of the eighteen century), it has been known that the sum of the masses of objects that interact or of the chemicals that react remain conserved throughout these processes. This remains an excellent approximation for everyday life and even most laboratory work.

However, Einstein has shown through his special theory of relativity that the mass m of an object moving at speed v with respect to an observer must be higher than the mass of the same object observed at rest m0 with respect to the observer. The applicable formula is

where c stands for the speed of light. This change in mass is only important when the speed of the object with respect to the observer becomes a large fraction of c.

The Quantum Concept of Mass
For further reference,see the :en:Gluon field and :en:Higgs boson

In atomic nuclei,i.e in :en:Protons and :en:Neutrons,the residual mass comes from the binding kinetic and potential energy of the quarks and gluon field. An analogy to go along with is to think of the 3 :en:quarks as balls with the gluons as a spring connecting the quarks. This mass accounts for ~99% of the mass of these :en:baryons with the remaining ~1% coming from the individual quarks which comes from quantum interactions with the Higgs field.

References

Related pages
 Mass versus weight
 Center of mass
 Gravity
 Density
 Body mass index
 Advanced topics:
 Standard Model 
 Higgs field.

Physical quantity
Matter
Mechanics
Basic physics ideas