What is the cause of brownian motionmolecules in a gas move, Ask an Expert

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What is the cause of Brownian motion?

Molecules in a gas move constantly, freely, randomly, in all directions and at high speeds. They are able to do so because the intermolecular force of attraction among the molecules is negligible when in a gaseous state. This constant motion of the molecules causes them to collide with anything in their path. For instance, dust particles will be bombarded by the molecules moving at high speeds, causing them to have a zigzag motion.

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