what is the law of conservaton of mass?
824169
http://en.wikipedia.org/wiki/Law_of_conservation_of_mass\n\nYou're welcome. :]
111372
mass is the amount of matter, weight is the force gravity exerts on an object. mass stays the same, but weight changes if you go to the moon etc.
124349
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.
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)
210438
the newton's three laws of motion are as follows: law of inertia ( an object at rest will stay at rest unless acted by an outside force, a moving will continue on ots motion unless acted by an outside force), law of acceleration ( thw acceleration of a body is directly propotional the force and inversely proportional to its mass: a=f/m) and the law of interaction ( in every action there is always an equal and opossite rreaction)
891994
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.
504321
Mass (according to Einstein) coz mass changes into mass.
1001813
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.
991058
mass =concentration\n-------\nvolume
1155012
Newton's "law" of gravity is a mathematical description of the way bodies are observed to attract one another, based on many scientific experiments and observations. The gravitational equation says that the force of gravity is proportional to the product of the two masses (m1 and m2), and inversely proportional to the square of the distance (r) between their centers of mass. Mathematically speaking, \n\nF=Gm1m2 / r2, \n\nwhere G is called the Gravitational Constant. It has a value of 6.6726 x 10-11 m3 kg-1 s-2.
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
705966
m = vd  where m is mass, v is volume and d is density.  So volume = size is important.
351894
The law of conservation of mass/matter (The Lomonosov-Lavoisier law) states that the mass of a system of substances will remain constant, regardless of the processes acting inside the system. An equivalent statement is that matter changes form, but cannot be created or destroyed. This implies that for any chemical process in a closed system, the mass of the reactants must equal the mass of the products.\n\nThe two posters above me are wrong. Just because we build and use resources, doesn't mean the weight goes away, it just changes form. People gaining weight, gain it from the earth, it doesn't magically appear.\n\nThe only way the earth would lose mass is, stuff leaving planet earth such as rockets, satalites, ect..\n\nThe only way earth would gain is the space stuff that hits earth every second, and adds to the total weight.
122737
Gravity is an example of a natural law. Something about two objects being attracted to each other.  Water molecules will form drops of rain because the molecules are attracted to each other.  Gravity is the result of a really large mass attracting other objects - earth holding moon in orbit, sun holding earth in orbit.  gravity is proportional to the size of the mass in question, sun's gravity is stonger than earth's and moon's gravity is weaker than both.
13922
Really basically, E=mc^2 (be sure to always write m and c as lower case) is the relationship between rest mass and energy. The conversion is pretty simple. The constant c is the speed of light defined as 299,792,458 m/s.\n\nWhat is more useful is perhaps an understanding of just how really huge an amount of energy that makes for even a small amount of mass. This is the reason why nuclear reactions (which convert mass into energy) are so energetic by comparison to chemical reactions (in which mass is more or less conserved).
437310
Every mass in motion is said to have mechanical energy.\nHowever a mass is also structure ed with atoms wich are also moving with mechanical energy. The is the energy of the structure. You can represent it a the total mass  time velocity of light squard. Usally in the motion of masses the mass changes are very small. Hence you can consider mass as a constant. The mass time the final velocity squared of the moving mass is the mecahnical energy of maas in motion. assuming there is no friction. if there is friction you must substract the energy loss due to friction.
1158383
the most common formulas involving mass and density are:\n\nD=M/V     (D is density, M is mass, and V is volume.   \n                the "/" sign means division)\n\nyou can use this equation to find other equations.\n\nVD=M        (Volume times Density equals Mass)\n\nM/D=V        (Mass divided by Density equals Volume)\n\n\nas far as definitions for mass and density, mass is how much matter is contained in an object and density is the ratio of the amount of matter to the amount of space it takes up.