Boyle's Law in a Bottle

Materials

Procedures

  1. Remove the tip cap from the syringe and pull on the plunger to draw about 9mL of air into the syringe and replace the tip cap to seal the air inside the syringe.
  2. Place the sealed syringe inside the 1-L pressure bottle.
  3. Use plumber's tape around the mouth of the 1-L bottle. This will help to seal in the air.
  4. Tighten the special cap fitted with a tire valve to the bottle.
  5. Twist the tire valve to a bike pump and pull the pump handle up to lock the bottle in position.
  6. Pump air into the pressure bottle to obtain a pressure reading of 50 to 60 psi (pound per square inch) on the tire gauge. DO not exceed 100 psi.
  7. Caution: Wear your goggles and do Not point the bottle at other students!
  8. Release a small amount of pressure by twisting the cap of the bottle. As soon as you see the syringe plunger start to move, immediately shut off the air by tightening the cap.
  9. Using the pump gauge, record the pressure.
  10. Record the volume of air trapped in the syringe at this bottle pressure.
  11. Control the amount of air released by loosening and tightening the cap.
  12. Record both the new pressure on the pump gauge and the new volume of air trapped inside the syringe.
  13. Repeat steps 8 and 12 at least 5 to 6 times.
  14. Release all the air and record the final volume of air in the syringe.
  15. Repeat the lab two (2) more times and find the best one to graph.
  16. Draw a "best-fit" graph by using volume (V in mL) against pressure (P in psi), y-axis against x-axis, respectively.

Data

Gas Pressure Volume of Air in Syringe
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??? ???
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??? ???

Questions

1. What is the manipulating variable? What is the responding variable? ???
2. Describe how the bottle feels when you release the air suddenly. ???
3. Describe the shape of the graph. ???



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