An empty 2-litre plastic bottle is sealed. If 500 cm³ of air is removed from the bottle using a pump, what happens to the mass and volume of the air remaining in the bottle?
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Worked Solution
Step 1: Removing air removes matter, so the mass of air in the bottle decreases.
Step [2-9]: Air is a gas and will always expand to fill the 2-litre container.
Step [2-9]: The volume of the remaining air is still 2 litres.
Correct answer: Mass decreases, Volume remains the same
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