This lesson, Gases & the Kinetic Molecular Theory moves students toward aligning the points of the Kinetic Molecular Theory and the properties of gases.

The Lesson:

Students will work with the KMT and the basic assumption behind the Theory that all particles of matter are in constant motion. In this lesson, students will use the Kinetic-Molecular Theory for Gases to describe the properties of gases. Each of the basic properties of gases are compared to the KMT—expansion, fluidity, compressibility, density, and diffusion. The difference between diffusion and effusion is included.


  • State the Kinetic-Molecular Theory of Matter.
  • Relate the five postulates of the Kinetic-Molecular Theory of Gases to the particular properties of gases.
  • Define the Ideal Gas, and discuss why “real” gases are not ideal gases.
  • Give two examples of conditions that cause gases to deviate the most from the ideal gas.
  • Describe the basic properties of gases including expansion, fluidity, compressibility, density, diffusion and effusion.


This lesson is included in our States of Matter Unit:

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