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Boyle’s law
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  • 2. Guides : NEXT – Next BACK – Back ACT - Activity BACK NEXT
  • 3. BOYLE’S LAW states that if the temperature is constant, as the pressure of the gas increases , the volume of a contained gas decreases. BACK NEXT
  • 4. Do you know him ? YES NO
  • 5. Robert Boyle is an English chemist that was the first to determine the quantitative relationship. BACK NEXT
  • 6. What is Boyle’s Law ? • Boyle’s Law is one of the laws in physics that concern the behaviour of gases • When a gas is under pressure it takes up less space: • The higher the pressure, the smaller the volume • Boyles Law tells us about the relationship between the volume of a gas and its pressure at a constant temperature • The law states that pressure is inversely proportional to the volume BACK NEXT
  • 7. How can we write Boyle’s Law as a formula? • Pressure is inversely proportional to the volume and can be written as: • Pressure a 1/volume P=pressure in N/m2 V=volume in dm3 (litres) k=constant BACK • This is more usually written as: • Pressure = constant volume • PV=k • P1V1=P2V2 NEXT
  • 8. Result of the experiment Pressure p Volume V PxV 1 40 44 2 26 52 3 20 60 4 17 68 What can you observe from this result ? BACK NEXT
  • 9. RESULT OF THE EXPERIMENT • The pressure x volume for each set of results remains constant • This is called Boyle’s Law • For a fixed mass of gas, at constant temperature, pV = constant or P1 x V1 = P2 x V2 BACK NEXT
  • 10. What can you conclude according to the result of the experiment ? BACK NEXT
  • 11. • Curved lines are hard to recognise, so we plot the volume against the reciprocal of pressure (ie. 1/p) • This time the points lie close to a straight line through the origin. • This means volume is directly proportional to 1/pressure or • volume is inversely proportional to pressure BACK NEXT
  • 13. A deep sea diver is working at a depth where the pressure is 3.0 atmospheres. He is breathing out air bubbles. The volume of each air bubble is 2 cm3. At the surface the pressure is 1 atmosphere. What is the volume of each bubble when it reaches the surface? BACK NEXT
  • 14. Follow these steps so that you can answer the problem easily : 1.) List first the given. P1 – 3.0 atm V1 – 2cm3 P2 – 1 atm
  • 15. Follow these steps so that you can answer the problem easily : 2.) Find the missing given. V2
  • 16. Follow these steps so that you can answer the problem easily : 3.) Write the formula. P1 x V1 = P2 x V2 V 2 = P1 x V 1 P2
  • 17. Follow these steps so that you can answer the problem easily : 4.) Solve the problem now. V 2 = P1 x V 1 P2 V2 = 3.0 x 2 1.0
  • 18. Follow these steps so that you can answer the problem easily : 5.) Write the answer now. V2 = 6cm3 BACK ACT
  • 19. Answer the following questions orally. Who is the chemist determine the quantitative relationship between the volume and pressure of the gasses ? State the Boyle’s Law. BACK NEXT
  • 21. Answer this problem ( 5 pts. ) and follow the steps to solve this problem : A balloon with a volume of 2.0 L is filled with a gas at 3 atmospheres. If the pressure is reduced to 0.5 atmospheres without a change in temperature, what would be the volume of the balloon? BACK NEXT