What is the complete definition of Mass?
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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
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The mass of any substance depends on how much you have of it, it is not a fixed amount.\nYou may be thinking of density perhaps?  The density of a substance is equal to its mass divided by its volume (D=m/v), density is the same for a given substance no matter how much you have.\nIf by chance you are talking about density, probably the most important liquid to know would be water with a density of 1 g/mL at room temperature.
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Mass.\n\nF=ma\n\nF is the force\nm is the mass\na is acceleration
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Actually the opposite. Conservation of Mass says that Mass can not be created or destroyed, only converted to a new form of mass. The only exception is in nuclear reactions, in which Mass can become Energy and vice versa.
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Mass  - Involving a large number people.\n\nDensity - The quality of being dense.\n\nVolume - Amount of space occupied by a substance, liquid, or a gas.
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go to encarta.msn.com and search for keys mass/solid structure, surface Structure
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Mass is measured in grams.
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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.
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Law of conservation of Mass is exactly what prevents something being permenantly destroyed or created from nothing. You can't destroy Matter and you can't create Energy from nothing, Everything that exists has existed since the begining of the universe. It is possible to turn matter into energy, as shown when burning fossil fuels or making an atomic bomb
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Look on a periodic table.\n\nIt should be listed below the atomic number as a decimal value.  The mass number is an average mass (in atomic mass units) of an element, based on different isotopes.  It equals the number of protons + the number of neutrons in the nucleus.
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An electron has a mass and that has nothing to do with where it is. The mass of an electron is 9.11 X 10 to the -32 kilograms.
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In meteorology, an airmass or air mass is a large volume of air having fairly uniform characteristics of temperature, atmospheric pressure, and water vapor content. Air masses cover many hundreds or thousands of square miles, and slowly change in accordance with the terrain they are over.
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Mass is the measurement of matter, usually in grams,\nkilograms, etc.\n\nMatter is any material found in the universe that is in one of three states- those being gas, liquid, or solid.\n\nThe law of conservation of matter and energy includes the\nassertion that there is a finite (limited) amount of matter and energy in the universe.\n\nMatter can be converted into energy (example: the sun\nconverts its matter into energy continuously in the process\nwe call nuclear fusion).
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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)
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I will assume you mean "mass divided by molecular mass." The molecular mass is, by definition, the mass of one mole of a substance. Thus, if you take a given mass and divide it by the molar mass, you will get the number of moles.  A good way to do this is to use demensional analysis, where you start with you mass (x grams) use your molar mass as the conversion (Z moles/ygrams) and multiply the two so that the grams cancel, leaving you with moles.
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Mass is a basic aspect of matter. Density is derived.\nA certain amount of mass in a certain volume gives a certain density.\nMany people confuse weight and mass. Mass is more basic. To have weight, you must have mass in a gravitational field. The gravitational field comes from another, separate, mass.\nAn apple has weight in the gravitational field of the earth (and the mass of the apple exerts a gravitational field as well, but much less).\nMass is best quantified (expressed through numbers) through inertia, the resistence to change of movement. The more something resists change in movement, the more mass it has.\nThe same size ball of lead will resist change in movement (be harder to throw) than if made of balsa wood. The resisted change in movement may not be a change in speed, but may be a change in direction, or a combination of the two.\nYou can tie a rock on a string, and twirl it in a circle at a constant speed, and since it's direction is changing, it's movement is changing (change in movement is acceleration). The pull on the string is the force of acceleration. If you cut the string, the rock flies away in a straight line.\nA more massive rock would exert more force on the string. The string will be tighter. This is the property of mass (inertia).\nIce floats on water, although it is made of water. It floats because the density of ice is less than water. It floats because after it displaces (pushes out of the way) it's weight (weight and mass are close for this purpose), it still has some volume left over that sticks out of the surface of the water. A steel cube the same size would sink, because after it had displaced it's volume in water, it would still weigh more than the water. Things that float are said to have positive bouyancy (ice). The water still lifts the steel, but not enough to float (negative bouyancy). A life preserver makes sure a person has positive bouyancey (floats) so he won't drown.\nThe steel is more dense than water or ice.\nVolume is length times width times height.\nIf you cut 6 one inch squares from paper, place one down, tape the edge of one square to each edge of the square lying down, bring all four squares up until they meet, tape the edges to fasten them, and place the other square on top, you have a volume of one cubic inch. Make the squares a foot, and you have a cubic foot, or a cubic what ever you make the square's sides. This is a cube. Volume is cubic in measurement.\nThe more mass there is  that cube, spread uniformly so that there is not a lot of mass in one spot and little in another, but the same amount, the more dense the cube is.\nLead is denser than steel, because a cubic inch (Or foot) of lead weighs more and is more massive than a cubic inch (or foot) of steel.\nLead is denser than water, water is denser than air,\nair is denser than vacuum (the absence of matter).\nHydrogen or helium balloons rise in air because they are lighter, less massive, than the same volume of air as the balloon would be, making them positively bouyant (they float in air). They displace (push aside) more than their weight of air for the same volume.\nSo mass is a basic measurement (quantity), and density is derived from mass of a certain volume, and is known as a derived quantity. \nDensity = mass/ unit volume (unit meaning one, as in one centimeter, one cubic centimeter or one cubic inch or one cubic foot in the case of volume). Mass would be in grams or kilograms (one thousand grams or 2.2 pounds). 454 grams make 1 pound. Grams are rather small.\nFor instance: 5 grams/cubic centimeter       or\n5 grams per (one)cubic centimeter      is the density. One is understood, not stated. This is how density is read (how you say it).\nI hope this helps.\nFor extra, there are a lot of math and physics pages at: http://www.khake.com/page47.html\nthat may interest you.
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I suppose mass is a fairly easily measured value. Compared to finding the number of atoms, it's easier to just stick a sample on a scale/balance and weigh it.\n\nAnd the masses provided on the periodic table are weighted averages of the different isotopes found in nature.