Question

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if we add some crystals of potassium permanganate in a tank containing 1000l of cold water then after some time the particles which settle down tend to move upwards .so when they move to upwards these particles travel more distance but in the case of cold food the particles of cold gases produced by the food cannot travel more distance and so we cannot sense the smell of cold food from large or considerable distance but in first case the particles travel more distance that is to upwards but in the second case the particles did not travel more distance and hence we cannot sense the smell of cold food from a distance why????
i am really confused

Answer 1

In the case of hot substances, the particles move faster and separate easily, and therefore, colour of potassium permanganate visibly speads quickly.

But with cold substances, the molecules are more closely packed together, and take more time to spread out.

Same case with smell; the diffusion rate is higher with hot food, but not as high with cold food.