Hot water turns browner much faster than cold water when coffee powder is added to it. Why?

Expert Answers

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Hi, Zain,

It is because of the heat in the hot water.  Being hotter, the atoms have more kinetic energy, which also means the atoms are moving faster.  Thus, the atoms in the coffee grounds and the atoms of the water in the hot water will collide a lot more than in the cold water, moving the coffee around the hot water a lot faster than in the cold water.

Good luck, Zain.  I hope this helps.

Till Then,


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