During May Day, many flowers were placed in the square of Hebi New District, and tourists could smell the flowers when they played in the square. This physical phenomenon is called _ _ _ _ _ _ _.

(1) You can smell the fragrance of flowers in the square, which is the result of the aromatic molecules in the flowers entering the air due to irregular movement;

(2) During the ascent of the hydrogen balloon, the atmospheric pressure outside the balloon is getting smaller and smaller, while the atmospheric pressure inside the balloon is unchanged, so the balloon volume is gradually increasing. When the atmospheric pressure inside the balloon is greater than the external atmospheric pressure, the balloon will burst;

So the answer is: diffusion; Random motion; Low; be more/bigger than

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