The particles of __________
move at random directions very quickly and travel in straight-line paths. In the process, they collide with one
another and with the walls of container. They change direction only when they rebound from the __________
The distance between particles is large compared to the size of the particles. The __________ between particles is negligible because of the large distance between them. This explains why a gas spreads. Its particles fill all the available space in the container.
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Answer: the particles of GAS
Explanation: