Data Bases • Custom Term Papers • Free Term Papers • Free Research Papers • Free Essays • Free Book Reports • Plagiarism? Links • Top 100 Term Paper Sites • Top 25 Essay Sites • Top 50 Essay Sites • Search 97,000 Papers @ DirectEssays.com • Search 101,000 Papers @ ExampleEssays.com • Search 90,000 Papers @ MegaEssays.com Free Essays • Term Paper Sites • Chuck III's Free Essays • Free College Essays • TermPaperSites.com • My Term Papers • Get Free Essays • Essay World • Planet Papers	Search Lots of Essays Back to Subjects - Science Gases Gases  Elemental (He) or molecular (co2).  No shape-expands to fill any container  Highly compressible (density function of applied pressure).  Individual molecules far apart from each other.  Gases exert pressure on any surface that it comes into contact with.  Units of pressure Nm-2 = Pascal’s  Standard atmospheric pressure typically supports 760mm Hg at sea level. (fixed quantity of gases & constant temp)  T = absolute temperature in K  In practice gases liquefy or solidify before 0 (K).  Equal volumes of gases at the same T&P contain equal numbers of molecules.  “count” molecules by measuring Volume at specified T&P = 1 atm (or 101.3 kPa) and Oc (273 K).  1 mole of gas occupies 22.4 at STP  Boyle’s : V ~ 1/P (n & T const)  Charles’ : V ~ T (n & P const)  Avogadro’s : V ~ n (P& T const) Applies when low P, high T, ie when no attractive force between molecules.  8.3143 JK-1 mol –1 P in kPa, V in L  0.0821 L atm K-1 mol-1 P= atm, V in L  Rearranging ideal gas equation. Multiply both sides by Molar Mass (M) Bibliography: Word Count: 332
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