pV = constant (Boyle's Law) AQA GCSE Physics

Which of these formulae is correct?

• V/p = Constant

• pV = Constant

• p₁V₁ = p₂V₂

• p/V = constant

What condition must be kept constant for Boyle's law to apply? (from the last question)

• Volume

• Energy

• Heat

• Temperature

The relationship between Pressure and Volume at a fixed temperature is...

• Complicated

• Inversely Proportional

• Directly Proportional

• Random

What are the units for Pressure?

• Henrys, H

• Siemens, S

• Pascals, Pa

• Newtons, N

A bike pump has 20cm³ of air in it at a pressure of 100kPa, the air is pumped into a tyre of volume 100cm³, what is the new pressire?

• 20 Pa

• 100kPa

• 20kPa

• 0.05kPa

Some gas is put into a syringe. The initial volume of the gas in the syringe was 12 cm³.The initial pressure of the gas in the syringe was 101 000 Pa. Calculate the constant

• 12,120,000 Pa cm³

• 0.00011 Pa cm³

• 8416 Pa cm³

• 1,212,000 Pa cm³

When the volume of gas in a syringe was 45 cm³, the pressure gauge showed a value of 60 kPa. Calculate the pressure in the gas when the volume of gas in the syringe was 40 cm³.

• 67.5 kPa

• 55.0 kPa

• 70.0 kPa

• 60 kPa

 The pressure of helium in a 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.

• 140 000 Pa

• 80 000 Pa

• 100 000Pa

• 120 000 Pa

pressure = 1.6 × 10⁵ Pa
Volume = 9.0 cm³
Calculate the volume of the gas when the pressure was 1.8 × 10⁵ Pa. The temperature of the gas was constant.

• 10.0 cm³

• 8.0 cm³

• 9.0 cm³

• 12 cm³

How confident are you are using pV = constant?

• This was easy, I got most of them right

• I got some right but I will need to try some more when I revise

• I didn't really understand how to re-arrange the equation but I could substitute. I didn't get many right.

• I don't understand how to substitute the terms so could not even attempt the maths