What causes bubbles to form on the inside of my drinking glass of Tap Water (UK)?

Question

As soon as the glass is filled the water is completely still however after maybe an hour bubble s start to form.

Answer 1

The aerator on your faucet spout.  That's what its job is. If you want to see the difference just unscrew the tip on the spout and then turn on the water.

Answer 2

Solubility of gases decreases as the temperature increases - so it is an effect of the dissolved gases coming out of solution as the water reaches the warmer room temperature.

Answer 3

Just the movement of the water puts air in the water.............. When the water gets a chance to sit,,,,,,,,,, It start releasing the air..............................!=)

Answer 4

Since tap water that you drink is typically colder when it comes out of the tap then when you let it sit, dissolved air will have a harder time remaining dissolved.  When the air bubbles out of solution it looks for places where it is easier to come out of solution like rough surfaces on your glass.

It is also easier for the air to become stuck there, making bubbles appear on the side of your glass seemingly coming from nowhere.  The dissolved air is also the reason why sometimes tap waer looks white and then clears up if given about a minute.

Answer 5

Pressure. Short and sweet.

Answer 6

It is probably dissolved air. Inside the pipe the water is cool and under pressure. When you release it it warms up and the pressure is released, so some of the air that is dissolved in it is released.

Answer 7

Do you mean right after you fill the glass? If it is, then its the pressure from the tap.  

Answer 8

Tiny specks of dirt or imperfections in the glass - often called 'nucleation sites' Its just one of those things i suppose ^_^

Hope this quelled your curiosity, check wiki for more info!