What is the difference between mass and weight?
468240
Mass is a direct measure of an object's inertia, and the strength of its gravitational pull. More often, we find it easier to say that mass is a measure of quantity. More mass = more interia, so it works out.\n\nWeight, the way we think of it, is a measure of the net downward force an object undergoes when placed in a gravitational field ("down" meaning toward the source of the gravitational force in question). On Earth, weight is a measure of the effect gravity has on an object.\n\nSince more mass = more for gravity to pull, objects with more mass also have more weight (at the same location in the same gravity field), so we generally use weight and mass interchangeably, and this doesn't cause too many problems.
829568
Mass is the amount of material in an object. Mass stays the same no matter what force is acting on the object. This makes mass different from weight, which depends on both the amount of mass and the amount of gravity
57362
Weight is a unit measure of gravitational force.
820356
mass = the amount of matter, independant of gravity and in sci units measure in kg's\n\nweight= force, the downward pull on an object due to gravity, measure in N (newtons)
975657
Most American countries use scales to measure an object's weight, or Earth's gravitational pull on it, while most European countries use balances to measure its mass- a measure of the amount of matter in the object. The reason for European countries to measure mass instead of weight is because mass is a more reliable way to measure things, because it doesn't change in relation to your position on Earth.
581268
The mass of any body changes with velocity.\n\nIf the masss of the body is m0 when it was rest, then the mass ,when the velocity is v, is  m =m0/ square root of {1- (v/c)^2}.\n\nThe momentum is  equal to mv which is greater than mov
964876
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.)\n\nIn 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.\n\nIn Einstein’s theory of Special Relativity and particle or quantum physics the mass of an object is the same in all frames of reference.\n\nAccording to Wikipedia:  http://en.wikipedia.org/wiki/Mass\n"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.\n\nIn classical mechanics, there are three types of mass or properties called mass:\n\n-  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. \n-  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.) \n-  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.\n\nAlthough 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."\n\nAccording to Wikipedia:  http://en.wikipedia.org/wiki/Invariant_mass\n"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 m
26504
The mass is a property of an object, a fundamental measure of the amount of matter in the object. The usual symbol for mass is m and its SI unit is the kilogram.\n\nThe weight of an object is the force of gravity on the object and may be defined as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
229095
mass doesn't change. Only weight changes because weight is mass times the acceleration due to gravity.\n\nWt=mg
286308
As such the smallest unit of weight is nanogram, but weight is a relative term that differs from one place to other depending on the gravitational force. Scientifically, mass is an important thing. The smallest unit to measure mass is "atomic unit" or au.\nIf u get a candy, for this answer, rate it as the best. :)
1152166
a:  specific gravity is the ratio a subtances density compared to water or other reference material.  Density is weight per unit volume.\n\nb: mass is amount of substance, weight is the mass as it is affected by gravity.
608880
And I see that you are no exception, as you HAVE confused them!!\n\nIn the S.I. system, mass is kg, and weight is N (that is Newtons)\n\nIn the Imperial system, mass is slugs and weight is pounds.\n\n1 slug is equal to 14.6 kg.\n1 lb. is qual to 4.5 N\n\nPeople generally confuse them because the authorities decided  to equate 1 kg to 2.2 lb.  Not that it makes that much of a difference if these are used for commercial and not technical/scientific purposes, since gravity is basically the same at all habitable places on Earth.
578713
U can a measure the mass of an object accurately using a Physical Balance.\nUnit of mass is kg in SI unit ysstem.\nMore accurate ways of measuring mass is done now.\n\nU can calculate it's weight by a formulae:\nW=mg.\nW-Wieght\nm-mass\ng-aceleration due to gravity (9.8 ms^-2)
169053
They have equal mass because mass does not change depening on where you are the weight would change because weight is a force and is dependent on gravity which in space would be less than on the earth.
1095815
Mass is the amount of matter present in a body and is an intrinsic property of the body. Mass of an object remains the same always at any place.\n\nWeight on the other hand is the force which a given mass feels due to the gravity at its place. Weight is measured in units of Force like Newton (which is the SI unit of Force).\nIf your mass is 60 kgs then your weight is approximately 60 x 10 = 600 Newtons. This is because\n\nForce = mass x acceleration (From Newton's second Law)\n\nThus, weight = mass x acceleration due to gravity
42452
Tell them that the mass is the actual ammount of stuff(matter) in a given object.  Weight is the force of gravity pulling on the stuff (mass or object).  The gravity is caused by the ammount of mass in the other object.  So on earth it has a constant mass so the ammount gravity on an object is constant.  Therefore on earth we can measure the mass of an object using its weight.
103036
We often use the terms "mass" and "weight" interchangeably in our daily speech, but to an astronomer or a physicist they are completely different things. The mass of a body is a measure of how much matter it contains. An object with mass has a quality called inertia. If you shake an object like a stone in your hand, you would notice that it takes a push to get it moving, and another push to stop it again. If the stone is at rest, it wants to remain at rest. Once you've got it moving, it wants to stay moving. This quality or "sluggishness" of matter is its inertia. Mass is a measure of how much inertia an object displays. \n\nWeight is an entirely different thing. Every object in the universe with mass attracts every other object with mass. The amount of attraction depends on the size of the masses and how far apart they are. For everyday-sized objects, this gravitational pull is vanishingly small, but the pull between a very large object, like the Earth, and another object, like you, can be easily measured. How? All you have to do is stand on a scale! Scales measure the force of attraction between you and the Earth. This force of attraction between you and the Earth (or any other planet) is called your weight. \n\nhttp://www.exploratorium.edu/ronh/weight/