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Lecture08222
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Transcript of Lecture08222
![Page 1: Lecture08222](https://reader033.fdocuments.in/reader033/viewer/2022051612/54c16edf4a7959bd568b4615/html5/thumbnails/1.jpg)
Gas State: Basics, Pressure and Its Measurement
Lecture 8
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Aristotle’s Elements
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Gases
everywhere.
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Some important gases
Oxygen O2
Nitrogen N2
Argon Ar
Carbon dioxide CO2
Methane CH4
Ammonia NH3
Chlorine Cl2Ethylene C2H4
Hydrogen H2
Helium
Hydrogen sulfide H2S
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Carbon cycle
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Gases are important.
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All gases
has remarkably similar physical behavior.
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The molecules
are much farther apart in the gas
than in either the liquid or the solid.
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What distinguishes gases from liquids and solids:
Gas volume changes greatly with pressure.Gas volume changes greatly with temperature.Gases have relatively low viscosity.Most gases have relatively low densities under normal conditions.Gases are miscible.
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Pressure (P)
is defined as the force exerted per unit of surface area:
Pressure=Force/Area
Pa=N/m2
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Gases exert pressure
on all surfaces with which they make contact.
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Evangelista Torricelli (1608-1647), Italian scientist
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Torricelli’s experiment
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Manometers are devices
used to measure the pressure of a gas in an experiment.
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Some widely used manometers
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A sample problem
on converting units of pressure.
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THE END