Law(s) : -- Boyle’s Law Charles’ Law Pressure Law

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Presentation transcript:

Law(s) : -- Boyle’s Law Charles’ Law Pressure Law Gas Laws Law(s) : -- Boyle’s Law Charles’ Law Pressure Law

Pressure and Volume Boyle’s law

How is pressure defined? Pressure is defined as the the force per unit area Pressure = Force / Area

To reduce the pressure on the snow, increase the area

The unit of pressure = N / m2 = Pascal (Pa) Pressure = Force / Area The unit of pressure = N / m2 = Pascal (Pa) Atmospheric Pressure = 100 000 Pa = 100 kPa

Bourdon Gauge

The whistle uncoils when air is blown into it.

Bourdon Gauge

Pressure - Volume (P-V) relation of a gas When studying the behaviour of gases, there are three quantities to consider: Pressure Volume Temperature

Consider: Variation of volume with pressure

Pressure Volume The volume of a fixed mass of gas at a constant temperature is inversely proportional to the pressure.

Pressure & Volume P  1/V P = constant / V P V = constant

Boyle’s law The volume of a fixed mass of gas is inversely proportional to its pressure (that the temperature is held constant)

Pressure & Volume P V = constant P1 V1 = constant eg. 20 x 27 = 540 P1 V1 = P2 V2 = P3 V3