1. GASEOUS STATE

2. PROPERTIES OF GAS
 No fixed shape
 No fixed volume
 Molecules are far apart
 Force of attraction least
 Freedom of movement maximum
 High kinetic energy
 Diffusion maximum

3. VOLUME OF GAS
Space requires to occupy
No definite volume
Volume of its container

4. PRESSURE OF A GAS
Force exerted on unit area
Gaseous molecules in random motion
Collide with one another and walls of the
container
Due to this exert pressure
Unit is atm

5. DIFFUSION
Molecules of gases mix together and spread
Examples
i. fragrance of jasmine flower
ii. Smell of kerosene
iii. Smell of perfumes
iv. Smell of rotten egg

6. LIQUEFIED GAS
By applying pressure
By decrease temperature
Situations
i. Liquefied gas
ii. Liquid ammonia
iii. Liquid nitrogen
iv. Liquid oxygen
v. LPG

7. GASEOUS LAWS
Boyle’s Law
Charles's Law
Avogadro's Law

8. BOYLE’S LAW
 The volume of a fixed mass of gas is inversely
proportional to its pressure at constant temperature
PV is a constant
 P1V1=P2V2

9. CHARLES’S LAW
At constant pressure the volume of a fixed mass
of gas is directly proportional to its temperature
in Kelvin scale
V/T is a constant
V1/T1 = V2/T2

10. AVOGADRO’S LAW
At constant pressure and temperature the
volume of a gas is directly proportional to
the number of molecules
Vn is a constant