# Gases - Chapter 5 Gases I PHYSICAL STATES OF MATTER-three...

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Chapter 5 - Gases I. PHYSICAL STATES OF MATTER -three states of matter: s, l, g Gas - no definite shape /no definite volume Liquid - no definite shape/definite volume Solid - definite shape/definite volume A. Gases -highly compressible -thermally expandable -have low viscosity -relatively low densities -infinitely miscible II. PRESSURE OF GAS -Pressure = force/area -Barometer - measure atmospheric pressure -Manometer - measure the pressure of a gas in lab; closed end manometer; the difference in column heights equal to gas pressure; in open end manometer pressure of gas is measured against atmospheric pressure -Units of Pressure - pascal (Pa) - 1N/m 2 ; (1N = 1 kg-m/s2) III. GAS LAWS -four variables: P, V, T, n; interdependent-any one can be determined by measuring the other three A. Boyle’s Law Robert Boyle At constant temperature, the volume of a fixed amount of gas is inversely related to the applied (external) pressure PV = constant V 1/P [T and n constant] P 1 V 1 = P 2 V 2 [T and n constant]

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Gases - Chapter 5 Gases I PHYSICAL STATES OF MATTER-three...

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