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Gases
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Introduction to Gases
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Pre LecturesIntroduction to
gases
Difference btwn States i distance btwn particles 8 how fast particles are moving
Gases lots of distance btwnparticles particles are movingvery quickly
will fill the volume of its container
Gas vs Vapour
A gas is a substance whichis normally gaseous under regulartemp and pressure
Avapour is the gaseous form of a substance which is normally a liquid under regular temp
and pressure conditions
Importantterminology equations
P Cpa force Pressure is measured using a barometer
Area
Hg rises in tube until force of Hg down balances
the force of atmosphere pushing up
Hg is densist metal we readily have access to
Our body is adapted to atmospheric pressure so we don'tfeel it
Common pressure units
Name Unit Patm
Atmosphere atm 1
Mm of Hg mmHg 760
Torr Torr 760
, 7
Pascal Pa 101325
Kilopascal kPa 101.325
Bar bar 1.01325
Mili bar mbar 1013.25
STP
Reference point for normal temp 8 pressure conditions
13 1 bar _0.987ohm T O c 273.15K
At STP the space occupied by 1 mole of gas is
I Mol gas 22.7L molar volume
Gas Law Rules
Boyle's Law Charter'sLaw Avogadro'sHypothesis
PV constant 1 K 273.15 TED equal volumes of gases the
Inverselyproportionate f costant T same Tsp have the same
RV PzVz constant of molecules
stare directlyproportionate Van are directly proportionate
VI
12
In constant
Ideal gas law
Combines boyle's law charle's law avogadro's law
PV n RT 13 0.08206 L atm 1m01 1
0.083145 t.ba mol.
8.3l45J mo1 K or L KPalmol K
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