Graham's Law Of Effusion
Graham's law, known as Graham's law of effusion, was formulated by Scottish physical chemist Thomas Graham in 1848. Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles. This formula can be written as:

where:
Rate1 is the rate of effusion of the first gas (volume or number of moles per unit time).
Rate2 is the rate of effusion for the second gas.
M1 is the molar mass of gas 1
M2 is the molar mass of gas 2.
Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molecular weight. Thus, if the molecular weight of one gas is four times that of another, it would diffuse through a porous plug or escape through a small pinhole in a vessel at half the rate of the other (heavier gases diffuse more slowly). A complete theoretical explanation of Graham's law was provided years later by the kinetic theory of gases. Graham's law provides a basis for separating isotopes by diffusion — a method that came to play a crucial role in the development of the atomic bomb.
Graham's law is most accurate for molecular effusion which involves the movement of one gas at a time through a hole. It is only approximate for diffusion of one gas in another or in air, as these processes involve the movement of more than one gas.

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The article Graham's Law Of Effusion at en.wikipedia.org was accessed 135 times in the last 30 days. (as of: 03/17/2014)
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Graham's Law of Effusion - ThinkQuest
Background: Graham's Law The ratio of the rates of effusion of two gases is equal to the square root of the inverse ratio of their molecular masses or densities.
library.thinkquest.org/12596/graham.html
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Graham's Law of Effusion - Iowa State…
Graham's Law Of Effusion. Graham's Law Of Effusion states that the rate of effusion of a gas is inversely proportional to the square root of its density.
group.chem.iastate.edu/Greenbowe/sections/projectfolder/GrahamsLaw.htm
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ChemTeam: Gas Law - Graham's Law
Discovered by Thomas Graham of Scotland sometime in the 1830's (not sure exactly when). To discuss this law, please consider samples of two different gases at the ...
www.chemteam.info/GasLaw/Gas-Graham.html
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Graham's law - Wikipedia, the free encyclopedia
Graham's law, known as Graham's Law Of Effusion, was formulated by Scottish physical chemist Thomas Graham in 1848. Graham found experimentally that the ...
en.wikipedia.org/wiki/Graham's_law
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graham's law
Graham's Law Of Effusion. The rate of effusion of a gas is inversely proportional to the square root of either the density or the molar mass of the gas.
www.chem.tamu.edu/class/majors/tutorialnotefiles/graham.htm
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What Is The Formula For Graham's Law of Diffusion and Effusion?
Graham's law expresses the relationship between the rate of diffusion or effusion of a gas and its molar mass.
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Graham's Law Example - Gas Diffusion-Effusion Example Problem
Graham's law relates the rate of diffusion or effusion of a gas to its molar mass. This example problem uses Graham's law to find the difference in effusion rates ...
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Grahams Law of Effusion - KentChemistry HOME
Graham's law states that the rates of effusion of two gases are inversely proportional to the square roots of their molar masses at the same temperature and ...
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Graham's Law of Effusion - the Division of Chemical Education
4.17 Graham's Law Of Effusion. Chemical Concept Demonstrated: Graham's Law Of Effusion. Demonstration: Using the apparatus shown and Graham's Law ...
chemed.chem.purdue.edu/demos/main_pages/4.17.html
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Chemistry Tutorial 3.4b: Graham's Law Of…
(C) 2010, Mark Rosengarten ... Don't really need to. Density = mass/volume, so to find the﻿ molar mass, just use the fact that at STP, gases occupy 22.4 ...
Search results for "Graham's Law Of Effusion"
Graham's Law Of Effusion in science
Graham's Law of Effusion - PhET - University of Colorado Boulder
Jan 18, 2010 ... Over the summer PhET has been hard at work upgrading our simulations for the new school year! Help support our continuing work and give ...
Graham's Law of Effusion - the Division of Chemical Education
4.17 Graham's Law Of Effusion. Chemical Concept Demonstrated: Graham's Law Of Effusion. Demonstration: Using the apparatus shown and Graham's Law ...
Graham's Law of Effusion - The WikiPremed MCAT Course
Purdue University - Graham's Laws of Diffusion and Effusion ... To understand Graham's Law, make sure you have a good conceptual picture of the particle point ...
Graham's Law of Effusion
Feb 2, 1999 ... Graham's Law Of Effusion. Diffusion is the spontaneous intermingling of one substance with another. This occurs with perfumes and aftershaves ...
Graham's Law of Effusion - ScienceGeek.net
George Wiger at California State University, Dominguez Hills. Graham's Law Of Effusion. This page provides work in the use of Graham's Law Of Effusion.
Chemistry 103 > King > Notes > Graham's Law of Effusion | StudyBlue
Chemistry 103 with King at University of Wisconsin - Eau Claire ... Graham's Law Of Effusion Diffusion: a process by which one gas gradually mixes with another.
Graham's Law of Effusion and Diffusion by Kyle Khun on Prezi
Nov 2, 2012 ... Educated in Scotland, University of Glasgow ... Developed Graham's law of diffusion and rate of gases Effusion Diffusion Law of Diffusion and ...
Graham's Law of Effusion - ChemWiki
Jan 9, 2010 ... Graham's law states that the rate of effusion of a gas is inversely ... UC Davis ChemWiki by University of California, Davis is licensed under a ...
Books on the term Graham's Law Of Effusion
General Chemistry, Enhanced Edition
Darrell D. Ebbing, Steven D. Gammon, 2010
Today we usually state Graham's Law Of Effusion in terms of molecular mass: the rate of effusion of gas molecules from a particular hole is inversely proportional to the square root of the molecular mass of the gas at constant temperature and ...
Archimedes to Hawking:Laws of Science and the Great Minds Behind Them
Clifford Pickover, 2008
GRAHAM'S. LAW. OF. EFFUSION. Scotland, 1829. The rates of effusion of two gases are inversely proportional to the square roots of the gases' densities. At equal pressure and temperature, less massive gases will effuse more rapidly than ...
Chemistry: Principles and Practice: Principles and Practice
Daniel L. Reger, Scott R. Goode, David Warren Ball, 2009
Argon Helium Vacuum chamber Figure 6.19 Relative rates of effusion of gases. Atoms of argon (yellow spheres) effuse through a small hole into a vacuum more slowly than do the lighter atoms of helium (blue spheres). Graham's law is ...
Chemical Principles
Peter Atkins, Loretta Jones, 2009
Effusion Escape of a gas through a small hole (or assembly of microscopic holes) into a vacuum Depends on molar mass and temperature of gas Graham's law Rate of effusion of a gas at constant temperature is inversely proportional to the ...
Chemistry and Chemical Reactivity
John C. Kotz, Paul M. Treichel, John R. Townsend, 2011
lO—now known as Graham's law—is readily derived from Equation ll.9 by recognizing that the rate of effusion depends on the speed of the molecules. The ratio of the rms speeds is the same as the ratio of the effusion rates: Rate of effusion of ...

Blog posts on the term
Graham's Law Of Effusion
Jose Guerrero Chemistry P1: Graham's Law of Effusion
Graham's Law The ratio of the rates of effusion of two gases is equal to the square root of the inverse ratio of their molecular masses or densities. The effusion rate of a gas is inversely proportional to the square root of its molecular mass.
vaticancityguerrero.blogspot.com/2012/03/grahams-law-of-effusion.html
kemikals: grahams law of effusion
Gases : Graham's Laws of Diffusion and EffusionOnly a few physical properties of gases depends on the identity of the gas. Diffusion - The rate at which two gases mix.
lenipskemikals.blogspot.com/2007/12/grahams-law-of-effusion.html
Sean S. Chemistry 1: Graham's Law Of Effusion
Graham's LawRates of diffusion and effusion depends on relative velocities of gas molecules. Diffusion is a natural tendency for mobile particles(gas and liquid) to travel continously and to go from areas of high concentration to areas of low concentration by gradual mixing and virtue of their kinetic properties.
youngfavortitez.blogspot.com/2012/03/grahams-law-of-effusion.html
Difference between Diffusion and Effusion
What is the difference between Diffusion and Effusion? Diffusion vs Effusion. Diffusion is the process by which molecules move and travel from one place to another. Effusion is the process by which molecules travel through a pinhole.
www.differencebetween.info/difference-between-diffusion-and-effusion
Calculator Programs: Chemistry: Graham's Law of Effusion
This is straightforward. Finds the mass of a gas during effusion.
calculatorprograms.blogspot.com/2011/04/chemistry-grahams-law-of-effusion.html
Chemistry: Diffusion and effusion
What is diffusion and effusion and what law did they help to inspire?.
chemistryhix.blogspot.com/2008/03/diffusion-and-effusion.html
why a balloon become smaller after a few days? - Question #354781 - Homework Help
Topic: Chemistry. Question: why a balloon become smaller after a few days? - Question #354781
www.enotes.com/homework-help/why-balloon-become-smaller-after-few-days-354781
Scope and excitement of physics: graham's law
Let us learn about graham's law ]]>Graham's law is also called as Graham's Law Of Effusion, was formulated by Scottish physical chemist Thomas Graham. Graham invented experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles.
scopeofphysics.blogspot.com/2010/09/grahams-law.html
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