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Unformatted text preview: • Latex is a porous material (tiny pores), from which balloons are made • Helium balloons seem to deflate faster than those we fill with air (blow up by mouth) The effusion rate, r , has been found to be inversely proportional to the square root of its molar mass: and a lighter gas will effuse more rapidly than a heavy gas: Basis of effusion • The only way for a gas to effuse, is for a molecule to collide with the pore or pinhole (and escape) • The number of such collisions will increase as the speed of the molecules increases Diffusion: the spread of one substance through space, or though a second substance (such as the atmosphere)...
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