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Pressure in Gases

Pressure in Gases. M.K.Rolley. Boyles law. Boyle discovered that for a fixed mass of gas the pressure is inversely proportional to the volume at constant temperature This can be expressed as PV= a constant or. P 1 V 1 =P 2 V 2. Where P1=initial pressure P2 = final pressure

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Pressure in Gases

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  1. Pressure in Gases M.K.Rolley

  2. Boyles law • Boyle discovered that for a fixed mass of gas the pressure is inversely proportional to the volume at constant temperature This can be expressed as PV= a constant or P1V1=P2V2 Where P1=initial pressure P2 = final pressure & V1=initial volume V2= final volume

  3. How to demonstrate this

  4. Results PV= constant

  5. Other Gas laws are: • Charles law: The Volume of a fixed mass of Gas is proportional to the absolute temperature • The Pressure Law; The pressure of a fixed mass is directly proportional to its absolute temperature • These may be combined to form the combined Gas equation:

  6. Combined Gas Equation Note P and V may be in any appropriate units as long as the same units are used on both sides of the equation T must ALWAYS be in Degrees KELVIN (ie Centigrade +273)

  7. Examples: 1. A fixed mass of gas at constant temperature has a volume of 500 cm3 at a pressure of 1 atm.What will its volume be at a pressure of 4 atm? 125cm3 a ) 300cm3 b)1800cm3 a) 10 atmos b) 0.2 atmos 4. The pressure of a gas at 27oC is 150kPa. Assuming volume is constant, What will the pressure be at a) 87oC b)127oC c)-83oC a) 180kpa b) 200kpa c) 95kpa

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