Boyle's law
3 marks · NormalA sealed syringe contains 40 cm³ of air at a pressure of 100 kPa. The syringe is slowly compressed to a volume of 16 cm³ at constant temperature. Calculate the final pressure inside the syringe.
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250 kPa (±2)
Common mistakes: Using the wrong ratio (e.g. not inverting the relationship); Forgetting units
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Marking points
M1 · 1 mark · States or uses p1V1 = p2V2.
M1 · 1 mark · Substitutes values correctly.
A1 · 1 mark · Final answer correct (250 kPa) with unit.
Worked solution
Boyle's law: p₁V₁ = p₂V₂