Lecture08222

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Information about Lecture08222

Published on July 29, 2008

Author: uladzimir

Source: slideshare.net

Description

a supplemental resource for students

Gas State: Basics, Pressure and Its Measurement Lecture 8

Aristotle’s Elements

Gases everywhere.

Some important gases Oxygen O 2 Nitrogen N 2 Argon Ar Carbon dioxide CO 2 Methane CH 4 Ammonia NH 3 Chlorine Cl 2 Ethylene C 2 H 4 Hydrogen H 2 Helium Hydrogen sulfide H 2 S

Oxygen O 2

Nitrogen N 2

Argon Ar

Carbon dioxide CO 2

Methane CH 4

Ammonia NH 3

Chlorine Cl 2

Ethylene C 2 H 4

Hydrogen H 2

Helium

Hydrogen sulfide H 2 S

Carbon cycle

 

Gases are important.

All gases has remarkably similar physical behavior.

The molecules are much farther apart in the gas than in either the liquid or the solid.

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.

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.

Pressure (P) is defined as the force exerted per unit of surface area: Pressure=Force/Area Pa=N/m 2

 

Gases exert pressure on all surfaces with which they make contact.

Evangelista Torricelli (1608-1647), Italian scientist

Evangelista Torricelli (1608-1647), Italian scientist

Torricelli’s experiment

Manometers are devices used to measure the pressure of a gas in an experiment.

Some widely used manometers

A sample problem on converting units of pressure.

THE END

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