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• Drop a crystal of copper sulphate or potassium permanganate into a glass of hot water and another containing cold water. Do not stir the solution. Allow

the crystals to settle at the bottom.
• What do you observe just above the solid crystal in the glass?
• What happens as time passes?
• What does this suggest about the particles of solid and liquid?
• Does the rate of mixing change with temperature? Why and how?

NCERT Class 9th Science Ch 1 Matter in Our Surroundings


This phenomenon is diffussion.
as time passes the particles will diffuses and spread their color.
yes the rate of changes in diffusion changes with the temperature . if the temperature is high then the rate of diffusion will more,if temperature is low then amount of diffusion is low
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