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Boyles law lab

- Purpose to investigate mathematical relationship

between pressure and volume - Sample calculations
- Diameter of piston ? 2.40 cm (2.30-2.50)
- Radius ? 1.20 cm
- Area ? ?r2 ? 4.52 cm2 (4.15 - 4.91)
- Book pressure ? average book weight
- area of

contact - ? 850 g / 4.52 cm2
- ? 188 g / cm2 (173 - 205)
- PV column should be 36,000 all the way down

y mx b P (constant)(1/V) 0 PV constant

(answer to both 1 and 2)

Conclusions and Questions

- If P doubles, V is cut in half. If P is tripled,

V becomes 1/3 of its original value. - As the pressure on a gas increases, the volume

of the gas decreases proportionally, provided

that the temperature and amount of gas remain

constant. I.e. P1V1 P2V2. - As volume decreases, there are more collisions

with the side of the container per unit of time,

thus the pressure increases. - P1103 kPa, V15.2 L, P2400 kPa, V2?
- Using Boyles law P1V1 P2V2,
- 103 kPa x 5.2 L 400 kPa x V2
- V2 (103 kPa x 5.2 L) / 400 kPa 1.34 L

- P1 700 mm Hg x 1 atm / 760 mm Hg 0.921 atm,

V1 200 ml, P2 ?, V2 950 ml - Using Boyles law P1V1 P2V2
- 0.921 atm x 200 ml P2 x 950 ml
- P2 (0.921 atm x 200 ml)/950 ml 0.194 atm

Conclusion

- By comparing values in the PV column and via the

graph we see that PV constant - This is called Boyles law (after the scientist

that first discovered the relationship) - We will be looking more closely at Boyles law
- For example, using the form P1V1 P2V2
- Read Results of Boyles Law Experiment on

handout. Do questions 1 6.

For more lessons, visit www.chalkbored.com

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