Chapter 8, Problem 61QRT

Interpretation Introduction

Interpretation:

Increasing order of average molecular speed of the given molecules should be given.

Concept Introduction:

Kinetic-molecular theory of gases:

Properties of gases are different from solids and liquids.  When pressure is applied to gases, they are easily compressed to smaller volume and they have low densities.  These properties can be explained by a theory called kinetic-molecular theory.

The four assumptions of this theory are given below:

• Gases are made up of particles like atoms or molecules which randomly move and there will be no attractive forces between them.
• Comparing the space occupied by the gas particles and the space between particles, the former is much smaller than the latter.
• The average kinetic energy of gas particles and the Kelvin temperature is proportional.
• There is an elastic collision between gas particles or with the wall of their container and thus no energy is lost during collision and total kinetic energy of the particles is constant.

Kinetic energy: The kinetic energy for the object is the energy of the object due to its motion and it is given by the following formula,

  ${\text{E}}_k\text{ =}\frac{\text{1}}{\text{2}}{\text{mv}}^{\text{2}}$

Where, $\text{m}$ is the mass and $\text{v}$ is the velocity of the moving particle.