1. Widely spaced particles: Gas particles are far apart compared to their size. This is because they have a lot of kinetic energy and move around freely.

2. Random motion: The particles move in random directions and at high speeds. They collide with each other and the walls of their container.

3. No fixed volume or shape: Since the particles are so far apart, they can easily expand to fill the entire container. They don't have a definite volume or shape.

Here's a simple representation:

Imagine a box. Inside the box, you would draw tiny dots (representing the particles) scattered throughout the box. The dots should be spread out, not clustered together.

To make it even more informative, you could:

* Draw arrows: Show the random movement of the particles by adding arrows pointing in different directions.

* Use different colors: If you are representing a mixture of gases, use different colors for the different particles.

* Include a note: Add a note explaining that the particles are not drawn to scale and are actually much smaller than the space they occupy.

Remember, this is a simplified representation. In reality, gas particles are constantly moving and colliding in a complex, chaotic way.