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Pressure in a gas Lesson Outcomes: • To know and to be able to explain a demonstration that proves that air exerts a pressure. (C/B) • Describe the simple mercury barometer and its use in measuring atmospheric pressure. (C/B) • Know what a manometer is. (C)

Pressure in a gas

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Pressure in a gas. Lesson Outcomes: • To know and to be able to explain a demonstration that proves that air exerts a pressure. (C/B) • Describe the simple mercury barometer and its use in measuring atmospheric pressure . (C/B ) • Know what a manometer is. (C). Starter. - PowerPoint PPT Presentation

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Page 1: Pressure in a gas

Pressure in a gasLesson Outcomes:• To know and to be able to explain a demonstration that proves that air exerts a pressure. (C/B)• Describe the simple mercury barometer and its use in measuring atmospheric pressure. (C/B)• Know what a manometer is. (C)

Page 2: Pressure in a gas

Starter

A rectangular storage tank 4m long by 3m wide is filled with an unknown liquid to a depth of 3m. The unknown liquid has a mass of 4800kg. Calculate:

a) Volume of the unknown liquidb) Density of the unknown liquidc) Weight of the unknown liquidd) The pressure at the bottom of the tank due to the liquid.

Page 3: Pressure in a gas

Answers

a) 4m x 3m x 3m = 36m3 (3)

b) 4800kg ÷ 36m3 = 133.3 kg/m3 (3)

c) 4800kg x 10N/kg = 48000N (3)

d) 133.4 x 10 x 3 = 4000 Pa

Page 4: Pressure in a gas

Air pressure demonstration

Page 5: Pressure in a gas

Air Pressure

• Air pressure is usually 100000 N/m2.• The can contains air particles and is also

surrounded by air particles. They are hitting the sides of the container on the inside and the outside. The vacuum pump removes the air particles from inside the can. The pressure caused by the particles on the outside collapses the can.

Page 6: Pressure in a gas

Worksheet

• The mercury barometer and manometer pressure gauge.

Page 7: Pressure in a gas

Recap of the lesson

• To know and to be able to explain a demonstration that proves that air exerts a pressure.

• Describe the simple mercury barometer and its use in measuring atmospheric pressure.

• Know what a manometer is.