# BEHAVIOR OF GASES

by • 10/09/2013 • GeneralComments (0)471

BEHAVIOR OF GASES:

1.            DIFFUSION:

DEFINITION:

The ability of gases to increase their volume by spreading is called DIFFUSION. Diffusion is measured by increase in volume. Because of diffusion gases intermingle with each other. It depends upon

1:            Kinetic energy of molecules

2:            Intermolecular spaces

EXPLANATION:

According to KMT

There are negligible forces present between molecules of gases and large spaces between them therefore gas molecules are in free motion so that ail gas molecules spread as the provided space and as a result the overall volume of gas increases.

2. COMPRESSION:

DEFINITION:

The property of gases to decrease their volume on the application of external force called “Compressibility”.

Compressibility is measured by decreased in volume.

It depends upon

1.            Intermolecular spaces

2.            Applied pressure

EXPLANATION:

According to KMT Large spaces are found between molecules of gases. On the application of external force the molecules of gases become closer to each other so that the volume of gas decreases, the phenomenon is called compression.

3.            PRESSURE:

The force per unit area on a substance is called pressure. Gases have the ability to exert pressure on other substance by colliding the molecules with them that is

 that is P  = F A

EXPLANATION:

According to KMT.

“Gases consist of molecules which can extert pressure but collective pressure of all gas molecules is called pressure exerted by gas”.

Unit:

The units of pressure are.

 In MKS system N or Pascal M2
 In CGS system Dyne cm2

And other units are:

atmosphere (atm)

Torr (mm of Hg)

psi (pound per square inches)

CONVERSION:

1 atm     =              760 Torr

1 atm     =              101300 or 1.01 x 105N/m2 or Pa

1 atm     =              14.7 psi

4.            TEMPERATURE:

The degree of hotness or coldness in a body or the intensity of heat is called Temperature.

OR

Temperature is used to determine the direction of heat flow. It has two major scales i.e. °C and °F.

UNIT:

In the System International the unit of temperature is taken as KELVIN (K)

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