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Topic: Conservation of mass

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Law of Conservation of Mass

Conservation of energy

Law of conservation of matter

Ex nihilo nihil fit

Classical mechanics

Potential flow

Chemical engineering

Euler equations

History of physics

General relativity

Corn Laws

Standard Model

Clifford algebra

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Math

	NationMaster - Encyclopedia: Law of conservation of mass
		The conservation laws show that matter and energy can be neither produced from nothing nor reduced to nothing, whether it be through a physical reaction (such as a collision), a chemical reaction (such as combustion) or a nuclear reaction (such as an atomic explosion).
		All of the conservation laws are based upon hundreds of years of empirical evidence and have as their authors some of the most respected scientists of all time.
		According to the conservation laws, the particle number (the sum of all the pluses and minuses) must be the same before the decay reaction as after.
	www.nationmaster.com /encyclopedia/Law-of-conservation-of-mass (360 words)

	Physical Science \| Session 3
		This is the principle of conservation of mass.
		The sum of the mass of 6 protons and 6 neutrons is 12.0956 atomic mass units (amu), while the mass of the carbon nucleus is 12.0000 amu.
		Thus, we must refine our principle of conservation of mass to be one of conservation of mass and energy because, under certain extreme conditions, they can transform into each other.
	www.learner.org /channel/courses/essential/physicalsci/session3/closer1.html (632 words)

	The Conservation Of Mass (The Mass Of Gas) (Site not responding. Last check: 2007-11-05)
		The Conservation Of Mass (The Mass Of Gas) Jake Carter Douglass Math and Science Academy 8035 South Dobson 543 North Waller Chicago IL 60619 Chicago IL 60644 (312)651-0998 (312)543-6176 Objectives: This experiment will help students with their understanding of matter in all of its phases.
		In furthering their knowledge of the laws of conservation of mass, the loss in mass can be accounted for, when the gas is allowed to escape from the container which it is produced in.
		The initial massing of the bottle, cap, water, and 1/8 piece of Alka-Seltzer tablet should be recorded on the sample data graph.
	www.iit.edu /~smile/ch9403.html (434 words)

	Conservation of Mass
		The conservation of mass is a fundamental concept of physics along with the conservation of energy and the conservation of momentum.
		From the conservation of mass, these two masses are the same and since the times are the same, we can eliminate the time dependence.
		The conservation of mass equation also occurs in a differential form as part of the Navier-Stokes equations of fluid flow.
	www.grc.nasa.gov /WWW/K-12/airplane/mass.html (655 words)

	Generalization of Mass-Energy Conservation and Einstein's Relativity
		Since the effective mass value that must be taken in the calculations for the proton and the electron leads to "reduced masses", the energy levels almost change solely due to the change of electron mass.
		Being negligible compared with the effect due to the change of electron mass, this variation of the proton mass is neglected.
		The variation of electron mass is taken into account in chapters three and also eleven of the Book: "Einstein's Theory of Relativity versus Classical Mechanics".
	www.newtonphysics.on.ca /faq/generalization.html (960 words)

	Conservation of Mass
		You may wonder why conservation of mass wasn't discovered until relatively modern times, but it wasn't obvious, for example, that gases had mass, and that the apparent loss of mass when wood was burned was exactly matched by the mass of the escaping gases.
		Conservation of mass therefore requires that the cross-sectional area of the stream shrink in inverse proportion to the increasing speed of the falling water.
		Conservation of mass is an extremely good approximation for all chemical reactions, since chemical reactions never release or consume enough energy to change the total mass by a large percentage.
	www.lightandmatter.com /html_books/0sn/ch01/ch01.html (7689 words)

	Beacon Lesson Plan Library
		Allow students to determine the mass of the balloon, flask, vinegar and baking soda, and to compare the mass to the combined original masses of the balloon, flask, baking soda and vinegar.
		The law of conservation of mass and energy may be demonstrated though the observation of the five simple reaction types: combination or synthesis, decomposition, single displacement or singe replacement, double displacement or double replacement, and combustion.
		Mass is not conserved in nuclear reactions (fission,fusion).
	www.beaconlearningcenter.com /Lessons/493.htm (848 words)

	Ideal Fluid Flow and Conservation of Energy and Mass
		The conclusion drawn from this is that the static pressure decreases in the region of high-speed flow and increases in the region of low-speed flow.
		The continuity equation states that the fluid “mass flow rate”—the amount of fluid per unit time—must be the same at any cross section of the pipe or else there is an accumulation of mass—"mass creation"—and the steady flow assumption is violated.
		Bernoulli's theorem is an expression of the conservation of the total energy; that is, the sum total of these energies in a fluid flow remains a constant along a streamline.
	www.centennialofflight.gov /essay/Theories_of_Flight/Conservation/TH8.htm (1210 words)

	Law of conservation of matter Summary
		Conservation of matter, therefore, implies that matter can be neither created nor destroyed--i.e., processes that change the physical or chemical properties of matter (such as change of state, from a solid to a liquid to a gas) leave the total mass of matter unchanged.
		In classical physics mass is conserved for kinematic reasons, as there is no way to change the mass and conserve the momentum for all observers at the same time.
		The law of conservation of matter was first clearly and unambiguously formulated by Antoine Lavoisier, who is often referred to as the father of modern chemistry.However, other scientists Mikhail Lomonosov (1748) had previously expressed similar ideas.
	www.bookrags.com /Law_of_conservation_of_matter (1507 words)

	Conservation of Mass
		The conservation of mass is a fundamental concept of physics along with the conservation of energy and the conservation of momentum.
		The mass of any object can be determined by multiplying the volume of the object by the density of the object.
		The conservation of mass gives us an easy way to determine the velocity of flow in a tube if the density is constant.
	www.lerc.nasa.gov /WWW/K-12/VirtualAero/BottleRocket/airplane/mass.html (484 words)

	mass conservation (Site not responding. Last check: 2007-11-05)
		This observation has an important and fundamental consequence: mass is neither created nor destroyed during the course of a chemical reaction.
		If atoms cannot be destroyed then the mass of reactants must equal the mass of the products in a chemical reaction.
		Mass conservation can be used in chemical calculations.
	www.iun.edu /~cpanhd/C101webnotes/matter-and-energy/masscons.html (193 words)

	Law of Conservation of Mass
		The law of conservation of mass or of matter, also known as the Lomonosov-Lavoisier law, states that the mass of substances in a closed system will remain constant, no matter what processes are acting inside the system.
		This law works fine for anything that is not approaching the speed of light; at high speeds, mass begins transforming to energy (for which reason, we now have the Law of Conservation of Mass and Energy).
		However, this means that in most situations the law of conservation of mass can be assumed valid.
	www.iscid.org /encyclopedia/Law_of_Conservation_of_Mass (263 words)

	ChemTeam: Lavoisier and his Law
		The manner in which the Law of Conservation of Mass was discovered did not follow the usual "scientific" way that is taught to students.
		Conservation of mass was amended due to the discovery of E = mc
		You may wish to research how the validity of the Law of Conservation of Mass was called into question in the early part of the 1900's and how the idea of the neutrino is related to this.
	dbhs.wvusd.k12.ca.us /webdocs/Equations/Conserv-of-Mass.html (1704 words)

	Re: Who discovered the law of conservation of mass, and when?
		The biggest problem with trying to look at the law of conservation of mass as a scientific discovery, is that that is not necessarily how it arises.
		It had been well known for many years that when iron rusts, the total bulk of rust produced is much greater than that of the original metal, and the actual mass of rust is a little greater than that of the metal it formed from.
		The idea of conservation of mass, and accounting in mass during chemical reactions was one of the more immediate spin-offs.
	www.madsci.org /posts/archives/sep99/936615897.Sh.r.html (940 words)

	mass-energy
		Mass interchangeability with energy stems from Einstein's Special Relativity.
		A chemical exothermic reaction emits such a tiny amount of energy, the mass loss is negligible but for nuclear reactions, it certainly is not.
		The total mass of an atom is LESS than the total mass of its parts.
	www.launc.tased.edu.au /online/sciences/physics/massener.html (575 words)

	THEORETICAL PHYSICS: ON CONSERVATION OF MASS
		Since energy is a conserved quantity, this equation appears to supply an adequate candidate, E/c^(2), to fill the role of mass in the "culture of force".
		Mass is a property of isolated particles, whose masses are intrinsic properties -- that is, all protons have one mass, all electrons have another, and so on.
		Rather, the energies and momenta of such particles are given in terms of their masses and velocities, by well-known formulas, and we constrain the motion by imposing conservation of energy and momentum.
	scienceweek.com /2005/sa050107-1.htm (1093 words)

	Conservation of mass Summary
		The law of conservation of mass (which is effectively conservation of weight when weights are properly taken) was clearly formulated by Antoine Lavoisier in 1789, who is often for this reason (see below) referred to as the father of modern chemistry.
		Historically, the conservation of mass and weight was kept obscure for millennia by the buoyant effect of the Earth's atmosphere on quantities of gasses, an effect not understood until the vacuum pump first allowed the effective weighing of gasses using scales.
		In particular, mass is conserved to a high precision in mechanical processes involving macroscopic objects, even if heat is allowed to enter or escape, because the energy and mass associated with this amount of heat, is small.
	www.bookrags.com /Conservation_of_mass (1329 words)

	[No title]
		Mass is assumed to be fundamental physical property.
		The conservation of mass-energy replaced the separate concepts of conservation of mass and the conservation of energy.
		The vector addition of momentum and the special relativity equations for relativistic mass are identical.
	home.att.net /~bob.rutkiewicz/Mass.htm (1228 words)

	Conservation of Mass Experiment
		Or does the exothermic energy have mass and that's were we lost the mass.
		Yes, energy can come from mass (E=mc^2), but (1) that is in nuclear reactions, and (2) the energies that you produce are so small that the mass loss -if any- would be so infinitesimally tiny (c is after all 3x10^8 - and it is squared).
		Mass and energy are related by the famous equation: E=mc^2.
	www.newton.dep.anl.gov /askasci/chem03/chem03466.htm (945 words)

	[No title]
		An increase or decrease in the mass of one of the substances in a reaction is a good indication that a chemical reaction has occurred.
		Mass of steel wool before reaction ______ g b.
		Mass of iron oxide after reaction ______ g c.
	www.hazelwood.k12.mo.us /~ccook/7thgradescience/3/conservationofmass.doc (370 words)

	Mass Flow Rate
		The conservation of mass is a fundamental concept of physics.
		The mass of any object is simply the volume that the object occupies times the density of the object.
		The conservation of mass specifies that the mass flow rate through a nozzle is a constant.
	exploration.grc.nasa.gov /education/rocket/mflchk.html (994 words)

	Foundations to Chemistry - adapted from "Chemistry, Matter and the Universe"
		In chemical processes, the most important property to be conserved is the number of atoms of each kind that are present.
		Counting atoms directly is not practical, but because mass-energy conversion is negligible in chemical reactions, conservation of the number of atoms effectively means the conservation of mass.
		From the discussion of moles and Avogadro's number in Chapter 2, we know that the mass of a substance divided by its atomic or molecular weight is the quantity of the substance in moles, and that one mole of any chemical substance contains the same number of particles.
	www.chem.ox.ac.uk /vrchemistry/Conservation/page07.htm (217 words)

	Foundations to Chemistry - adapted from "Chemistry, Matter and the Universe"
		With nuclear reactions, the energies involved are so great that the changes in mass become easily measurable.
		The answer, as we mentioned in Chapter 2, is that a helium atom is lighter than the sum of two protons, two neutrons, and two electrons.
		Some of the mass of the separated particles is converted into energy and dissipated when the nucleus is formed.
	www.chem.ox.ac.uk /vrchemistry/Conservation/page21.htm (215 words)

	Unit Operations in Food Processing - R. L. Earle
		The law of conservation of mass states that mass can neither be created nor destroyed.
		This is a more complex concept than the conservation of mass, as energy can take various forms such as kinetic energy, potential energy, heat energy, chemical energy, electrical energy and so on.
		From these laws of conservation of mass and energy, a balance sheet for materials and for energy can be drawn up at all times for a unit operation.
	www.nzifst.org.nz /unitoperations/introduction2.htm (1037 words)

	Mass-Energy Conservation in Reactions
		And this conservation of mass-energy has been confirmed millions of times (provided of course all factors such as the generation of neutrinos) are taken into account.
		You need to clarify that bonds are not objects, they do not have mass, and that exothermic/endothermic chemical reactions are the result of the difference in the bond energies of bonds broken and bonds formed, not mass conversion.
		The mass picked up by the container would be exactly the mass previously owned by the free-flying IR (infra-red) photons that were absorbed in the container.
	www.newton.dep.anl.gov /askasci/chem03/chem03641.htm (1829 words)

	conservation laws
		Each describes a quantity that is conserved, that is, the total amount is the same before and after something occurs.
		In the 1930s, when conservation of momentum seemed to be violated in such events, particle physicists realized that there must be unseen particles.
		This is an observed event that conserves both electric charge and baryon number.
	quarknet.fnal.gov /toolkits/ati/conservation.html (558 words)

	Mass and Energy Conservation in Nuclear Decay (Site not responding. Last check: 2007-11-05)
		And neutrons are a little heavier than protons, so keeping the same mass umber doesn't necessarily mean you end up with exactly the same mass.
		It means that mass (m) and energy (E) are really the same thing, and that you can convert one into the other using the speed of light, c.
		The mass of the electron makes up for this somewhat, but if you do the math, you'll see that there's still some mass "missing" from the right side of the reaction.
	www.colorado.edu /physics/2000/isotopes/mass_conservation.html (292 words)

	Law of Conservation of Mass Energy (Site not responding. Last check: 2007-11-05)
		There is a scientific law called the Law of Conservation of Mass, discovered by Antoine Lavoisier in 1785.
		The Law of Conservation of Mass is still a useful idea in chemistry.
		The mass loss or gain due to energy loss or gain in a chemical reaction may someday be something that is routinely measured.
	dbhs.wvusd.k12.ca.us /webdocs/Thermochem/Law-Cons-Mass-Energy.html (342 words)

	Law of Conservation of Mass (Site not responding. Last check: 2007-11-05)
		Discovering the mass of a gas is a surprise to many students.
		The law of conservation of mass states that the mass of the reactants in any chemical equation equals the mass of the products.
		The law of conservation of mass is an important law of chemistry and holds true for all chemical reactions.
	www.ncpublicschools.org /curriculum/science/scos/1999/physicalscience/resources/17conservation (396 words)

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