There are bubbles in my water. Why

yesterday night i was out of water so i just filled my cup up with the bathroom sink water. This morning and all day the water has bubbles around the glass in the water. the water from the kitchen does not do this. why did this happen?

Atmospheric gases such as nitrogen and oxygen can dissolve in water. The amount of gas dissolved depends on the temperature of the water and the atmospheric pressure at the air/water interface. Colder water and higher pressure allow more gas to dissolve; conversely, warmer water and lower pressure allow less gas to dissolve.

When you draw a glass of cold water from your faucet and allow it to warm to room temperature, nitrogen and oxygen slowly come out of solution, with tiny bubbles forming and coalescing at sites of microscopic imperfections on the glass. If the atmospheric pressure happens to be falling as the water warms, the equilibrium between gas molecules leaving and joining the air/water interface becomes unbalanced and tips in favor of them leaving the water, which causes even more gas to come out of solution. Hence bubbles along the insides of your water glass.

The most likely reason (besides the long one about the gases coming out) is that your bathroom sink as a screen just inside the nozzle (you should be able to feel it with your finger) that breaks up the stream and adds air which reduces splashing that would occur with a solid stream. And while you can have the same thing in the kitchen but it is often taken off to allow a fitting to put the dish washer on the nozzle. We took ours off because wife (who is blind) drinks water from her hands and does not like the aerated water - when the water is turned up it splashes badly across the sink.

minerals in the water...