KTG Flashcards
When does a gas behave like an ideal gas
At high temperature and low pressure
give the postulaes of kinetic theory of gases
(i) The gas consists of a large number of molecules which are identical in all aspects for a given gas.
(ii) The gas molecules in a continuous state of random motion, obeying newton’s laws of motion
(iii) The molecules do not exert any force on each other, except during collisions.
(iv) all molecular collisions are elastic in nature( energy and momentum is conserved). These collisions are instantaenous
(v) The size of a molecule of a gas is extremely small compared to the distance between two gas moelcules.
(vi) The gas molecules move in a straight between any two successive collisions. These distance covered between two successive collisions is called as mean free path.
vii) molecular density is uniform throughout the gas
what is gas pressure
the pressure exerted by a gas due to continouus bombardment of the gas molecules against the wall of the container.
P= 1/3 nm v^2
n- no of gas molecules per unti volume
m- mass of each gas molecule
v2- mean square velocity
What js an ideal gas
A gas such that:
i. The molecules are point masses
ii. There are no intermolecular forces between the gas molecules
iii. The gas obeys all the gas laws
Define mean free path
It is the distance travelled by the gas molecule between two successive collisions
What is root mean square velocity
It is the square rootof the sum of the squares of the velocity kf each molecule divided by the total number of molecule
