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Q1.
The photograph below shows a balloon filled with helium gas.
(b) The pressure of the helium in the balloon is 100 000 Pa.
The volume of the balloon is 0.030 m3 .
The balloon is compressed at a constant temperature causing the volume to decrease to 0.025 m3 .
No helium leaves the balloon.
Calculate the new pressure in the balloon.
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New pressure = _______________ Pa (4)
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pressure × volume = constant
100 000 × 0.030 = 3000
p × 0.025 = 3000
p = 3000 ÷ 0.025
p = 120 000 Pa
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