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Chapter 5 - Chapter 5 Gases 5.0 Introduction Gas Expands to...

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Chapter 5: Gases 5.0 Introduction Gas - Expands to fill its container, No fixed volume, No fixed shape, Easily compressed Liquid - Flows to fill its container, Fixed volume, Assumes shape of container, Slightly compressible Solid - Fixed Volume, Definite Shape, Very Difficult to compress Pressure of Solids Earth’s gravitational attraction pulls everything towards its surface - Force (Weight) = Mass(kg) x Acceleration, g (m s -2 ) - Pressure (Pa) = Force (N) / Area (m 2 ) Pressure of Liquids Earth’s gravitational attraction pulls everything towards its surface Gases Gas volume changes greatly with pressure , Gas volume changes greatly with temperature , Gases have relatively low viscosity , Most gases have relatively low densities , Gases are miscible 5.2 Pressure : The Result of Molecular Collisions Gas Pressure : collision of gas molecules ( KMT theory ) with surfaces…. - SI unit of pressure is the pascal (Pa) (N/m2) . kPa are often used, though Atmosphere (atm) and mmHg (Torr) are the most common units 5.2 Pressure
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