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13.2 Up Up And Away

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13.2 Up Up And Away

1. 1. Matter Very Simple Up, Up and Away
2. 2. Evidence for Gases <ul><li>Last lesson, we found out: </li></ul><ul><ul><li>Why gases behave as they do – they are made of molecules that collide with their container </li></ul></ul><ul><ul><li>How to measure the mass of a gas – all gases have mass </li></ul></ul><ul><ul><li>How microscopic behaviour of a gas explains its macroscopic behaviour – molecular collisions can account for changes in pressure </li></ul></ul><ul><ul><li>Boyle’s Law – Pressure x Volume are constant for a fixed amount of gas </li></ul></ul><ul><ul><li>PV = Constant for a sample of gas </li></ul></ul>
3. 3. Pressure, Volume and Temperature <ul><li>We will find out: </li></ul><ul><ul><li>How volume changes with temperature – Charles’ Law </li></ul></ul><ul><ul><li>How pressure changes with temperature – Pressure Law </li></ul></ul>
4. 4. But what happens if we change temperature..?
5. 5. Changes in Temperature, Changes in Volume Increase the temperature and record the length of the gas column etc. 40 30 20 Length Temperature
6. 6. Charles Law <ul><li>For a fixed mass of gas </li></ul><ul><li>Volume is proportional to Temperature </li></ul><ul><li>Graph should extrapolate to zero volume at absolute zero: </li></ul><ul><li>-273.16 o C </li></ul>
7. 7. Changes in Temperature, Changes in Pressure Increase the temperature and record the pressure etc. 40 30 20 Pressure Temperature
8. 8. Pressure Law <ul><li>For a fixed mass of gas </li></ul><ul><li>Pressure is proportional to Temperature </li></ul><ul><li>Graph should extrapolate to zero volume at absolute zero: </li></ul><ul><li>-273.16 o C </li></ul>