Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
![Pressure is caused by gas moving and
the air the it is up into the long Observe
e gas its units are given
of a gas at the same time. · The of a is the total
barometer, on the of the dish of As
atmospheres and of (mm Hg or Pressure
When you listen to a weather hear the and
laboratory, a like the one in In this
Scientists the of and temperature
pressure. The air is with a In your science
the
space
in milliliters (ml),-liters (1), or cubic centimeters (cc).
Units of pressure include
torr). Pressure
bumping into the sides of their container.
atmospheres (atm) and millimeters of mercury (mm Hg Of
measurements are usually based upon barometric readings.
When
air
no.
barometer, the air presses down on the surface of the dish of mercuty-
the air pushes the mercury,
in the drawing that the normal or standard pressure of the atmosPierer
which is I atm, supports a column of mercury 76 cm or 760 mm high..Thus,
pressure of 1 atm = 760 mm Hg = 760 torr.
into the long glass tube. Observe
dn
it is forced
Fig. 7-1
Vacuum
76 cm
760 mm
Mercury
The temperature of gases is usually measured in degrees Celsius (°C) or
Kelvin (K). Kelvin temperature (KEHL-vihn TEHM-puhr-uh-chur) is equal
to the Celsius temperature plus 273 degrees.
2. A barometer reading shows that air pressure is 750 mm Hg. Is the air
pressure above or below normal? How can you tell?
poa
.A gas that behaves exactly as the kinetic theory says is an ideal gas
(eye-DEE-uhl GAS). There are no ideal gases, however, only real gases.
Under ordinary conditions, real gases behave almost like ideal gases. Under
conditions of low temperature and high pressure, gases do not behave as
described in the kinetic theory. Hydrogen and helium are two gases that
behave most like ideal gases under most conditions.
Leaon 7 Natue of Gases](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb19a6b04-6c0c-4107-b369-970fbe5270ed%2F4ddd95e4-9eec-449d-9717-98c5f0b4d9e8%2Fizvpt.jpeg&w=3840&q=75)
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