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Why does tea stain metal?

I've got a sinking feeling

This follows nicely on from the question “Why is the top half of my tea too hot but the bottom half too cold?”

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Posted by on December 8, 2012 in Why?

 

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Why is the top half of my cup of tea too hot but then the bottom half too cold? (Also, why does tea make people feel better?)

You’d think it would be the other way around, wouldn’t you? The top surface steaming away happily, losing all its heat to the air. The bottom half is insulated by your mug, which should mean the last bits are still warm by the time you get to them.

But no.

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Posted by on October 21, 2012 in Why?

 

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