Why does boiling soup not steam?

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I imagine the lack of steam has to do with the relative amount of water in soup. A pint of water is 100% water, but a pint of soup is probably much less than 20% water, so the amount of steam (vapourised water) coming off the soup and condensing (making it visible in air) will be proportionally less. The rest of the soup will be solid and just burns and sticks to the bottom of the pan, if you're me that is.

My mum always told me not to boil soup anyway though as it makes it taster bitter. Something to do with "burning" the cream in it?....
 
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