Exam-style question
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Which of the following best describes the relationship between pressure and volume for a gas at constant temperature according to Boyle's law?.
- A.Pressure is directly proportional to volume
- B.Pressure is inversely proportional to volume
- C.Pressure is independent of volume
- D.Pressure is proportional to the square of volume
Model answer
What a good answer should say
- Pressure is inversely proportional to volume.
Explanation
Why this works
Formula/rule: P1V1 = P2V2. Substitution: If V1 increases, V2 must decrease to keep the product constant.
Working: P2 = P1V1/V2. Answer: Pressure inversely proportional to volume.
Units/Conclusion: No units required; the conclusion is that pressure and volume vary inversely.
Common mistake
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