When I run the hot tap at work very slowly it looks very cloudy, in fact its loads of tiny little bubbles. If I run the water faster they dissapear. I'm guessing some sort of cavitation is taking place.

Strangely this doesn't happen with the hot water at home.

Has anyone elso noticed this phenomonom?

cheers

fj

When water freezes inside various tubs and containers, sometimes the ice has large holes in it. They are roughly flying-saucer shaped and filled mainly withy air, but can also contain some liquid water. Dissolved air forms small almost cylindrical bubbles, but how are the large holes formed?

What is the velocity of soda bubbles? I have noticed that when I pour a bottle of soda into a glass, eventually I can match the speed of which I pour the soda out to the speed of the soda fizz, making the bubbles neither lower or rise. So, is it possible to calculate the speed of bubbles, or are there different variables that define it?

On a camping trip over the weekend we tested how a gummy bear would melt over a campfire. The result was an expanding bubbling effect. What exactly is it in the gummy bears which makes the food bubble up?

Hypothetically, if you had a gas made of really heavy atoms/molecules (although it's unlikely that they would be stable at the kind of Uranium-heavy I'm thinking of, let's say that hypothetically they are) in a liquid made of really really light molecules or atoms (e.g hydrogen), and say that temperature isn't going to change the given states of the elements (very very hypothetically), and so they can exist in the states they need to together, could the bubbles go down? Or would the relative densities make the masses of the atoms and molecules irrelevant? 

If a glass of freshly-poured tap water is left to stand for a while, bubbles begin to appear under the surface of the glass. The bubbles do not seem to rise, and will remain there until the glass is drained. What causes these bubbles?

We have a toaster with a plastic lid. One is supposed to put the lid on only after the toaster has cooled off, to protect the inside of the toaster from dust. But apparently some time ago someone neglected the pictogram and put the lid on while the toaster was still rather hot. Now in the most heat-exposed places, the plastic has become of a clearer transparent color, more irregular shape of surface, and there are a lot of fine bubbles inside, about half a millimeter in diameter. My question is: What is in the bubbles and how did it get there? Did the plastic contain fine dispersed air initially? Or maybe water or some organic components that "boil" at a moderate temperature?

A few days ago I noticed that bubbles floating on my dirty washing-up water had somehow arranged themselves into a perfect formation. Each bubble was exactly the same size, and as they stuck together they formed a perfectly regular matrix.

I've posted some photographs here: http://zump.net/bubbles/.

My first theory was that a sieve or grater might have filtered the bubbles, but I have been unable to repeat the appearance. Any theories out there?

Alan Bradshaw, Bradford, West Yorkshire, UK