Boyle's law
2 marks · EasyA gas in a sealed syringe has a pressure of 80 kPa and a volume of 25 cm³ at constant temperature. What will its pressure be if the volume is reduced to 20 cm³? Give your answer to 2 significant figures.
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100 kPa (±1)
Also accept: 100; 100 kPa
Common mistakes: Not keeping units consistent; Incorrect rearrangement
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Marking points
M1 · 1 mark · Correct substitution into p1v1 = p2v2
A1 · 1 mark · Correct final answer: 100 kPa (to 2 s.f.)
Worked solution