I notice when I boil a pot of water, it makes a hissing sound, and after about 5 minutes it almost stops, then it

I notice when I boil a pot of water, it makes a hissing sound, and after about 5 minutes it almost stops, then it starts up again progressively until it starts to boil. Why does it get quiet and start again?

Posted on March 12, 2013 by in Question. Comments Off on I notice when I boil a pot of water, it makes a hissing sound, and after about 5 minutes it almost stops, then it