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Collisions between gas particles and between particles and the
container walls are
collisions because there is
no overall loss of kinetic energy.
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Elastic collisions

Explanation:

The collision between gas particles and the container walls are elastic collisions because there is no overall loss of kinetic energy.

This is one of the assertions of the kinetic theory of gases.

Elastic collision is a form of collision in which the two molecules does not stick together. It is random and independent in nature.

Through this assumption, we can make a wide array of assumption about the properties of gases without getting it complicated.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.