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water in glass

Al ameen
in Applied Chemistry

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Hi every one. why water in glass is warmed and the glass cup warmed slowly?

Warmed by? A microwave?

 

Microwaves only excite watermolecules. This means they start vibrating more (vibrating = energy = heat). This heat has to be transferred to the glass.

If you mean in a microwave then it goes like this. Water molecules tend to absorb photons in the microwave range and so are "excited" by them. As heat is a measure of somethings "excitement" (more correctly how quickly the molecules are moving) the water gets hotter.

 

The glass gets warmer by conduction of the heat from the warmer liquid.

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