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Lecture 7

sbc 200 Lecture Notes - Lecture 7: Gas Laws, Atmospheric Pressure, MiscibilityPremium

2 pages47 viewsFall 2016

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sbc 200

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Physical States of Matter (Distinguishing gases from liquids and solids)
Gas volume changes significantly with pressure.
Solid and liquid volumes are not greatly affected by pressure.
Gas volume changes significantly with temperature.
Gases expand when heated and shrink when cooled.
The volume change is 50 to 100 times greater for gases than for liquids and solids.
Gases flow very freely.
Gases have relatively low densities.
Gases form a solution in any proportions.
Gases are freely miscible with each other
Gas Pressure and its Measurement
Pressure = force/area
Atmospheric pressure
arises from the force exerted by atmospheric gases on the earth’s surface.
decreases with altitude.
Common units of pressure
Normal Atmospheric Pressure at sea level and 0
Pascal; Kilopascal
1.01325E5 Pa; 101.325kPa
1 atm
Millimeters of mercury
760 Torr
1.01325 bar
The Gas Laws
The gas laws describe the physical behavior of gases in terms of 4 variables:
pressure (P)
temperature (T)
volume (V)
amount (number of moles, n)
An ideal gas is a gas that exhibits linear relationships among these variables.
No ideal gas actually exists
Boyle’s Law
At constant temperature, the volume occupied by a fixed amount of gas is inversely proportional
to the external pressure.
V= constant/p
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