Why do bubbles appear in a glass of water left overnight..yes I know that gas comes out of solution..but why?
956501
Air, being in solution, is lost all the time at the top of the glass of water and nobody is aware of it.  Air particles by the same effect tend to break away from the water body at the glass sides and bottom.  Contrary to the top, there is a glass barrier, and air particles simply cluster together as small bubbles.  These bubbles of course become bigger with time and some become big enough to break away and float up to the surface.  This effect is much more apparent if you heat the water lightly as the air in solution expands.
731331
I've heard that its the boiling water that freezes first. \n\nI think because the water molecules are hot (i.e. they are moving fast) the energy (or heat) will escape (move to equilibrium with other items in the freezer) at a faster rate than the water molecules in colder cup of water. \n\nBut really I'm mostly guessing with my explanation.
155067
The liquid molecules begin to heat up which causes them to increase their moleculer movement. They eventually move very far apart which causes them to be in the "gas" state.
878042
As the temperature of a liquid increases, the less gas it can hold dissolved. If you set a cold glass of water on the counter, it contains dissolved air. That is what th fish breath, dissolved air. As it warms less air can stay dissolved, so it comes out of solution on the side of the glass.\n\nIt is not the H or O from H2O
140901
It will not produce any air bubbles if it has no H2O.If it has H2O,air bubbles will produce because the H2O molicules at the bottom get heated and it runs as the tail gets heated monkey and go to the top and it will send the next molecule in the bottom gets heated and comes to top and the whole cycle will be again repeate and repeate.
150532
The bubbles are steam, or water vapor.  They are NOT from hydrogen and oxygen.
819069
I got this from my physics prof.  Take a full glass of water, preferably a wine glass, and and some food colouring for the water.  Take a clear piece of acetate and cut it in a circle for the top of the glass.  The piece of acetate needs to be larger in circumference than the glass though.  Place the acetate on top of the glass and turn the glass over.    Explain why the water doesn't escape.  The answer might surprise you.  A hint is because of pressure but how much is there, where does it come from, and what is its dimension?
29645
It probably is evaporating from the top. The bubbles on bottom are just more visible.
249282
Despite the air bubbles, mine seems to be pretty random.\n\nBut I'm curious, did you think that some answers are more common than others? I'll give mine a shake ask what it thinks is the most common answer...\n\nConcentrate and ask again.\n\nDamn!\n\nVery Doubtful.\n\nHmmmm...
920556
WOW Joyce, your question is the second time I've ever heard of (actually SAW it the first time) something like this.\nWe'd discovered that the water stabilizer had reacted with one of the pigments in the paint inside making both, a gas pocket, AND a cloudy mixture inside. Unfortunately, there's not a whole lot you can do about it except for taking it back where you bought it from and maybe trading it for another?\nHope that helps.
478525
Everyone says that The surface tension causes the bubble to be spherical. But how? and Why? \n\nLets explain surface tension first- \nIn an air-water interface, the molecules that are close to the surface are attracted by fewer molecules of the liquid than the ones that are NOT close to the surface. The former thus, has less attractive potential energy than the latter, right?\n\nNow, for any matter (solid or liquid), attractive potential energy results in stability & repulsive energy results in instablity (common sense). \n\nSo, it is energetically unfavourable to have a surface for a liquid (or solid) as it results in loss of attractive potential energy.\n\nNow, for that reason, a bubble wants to have the lowest possible surface area to remain stable. Now, using some high level mathematics, someone found out that a sphere has the lowest possible surface area for a given volume. (it is better than a cube atleast).\n\nHence why we can see that the water bubbles and drops tend to be spherical. Due to the effect of gravity, although the drops appear oval in shape but, in the absense of gravity, all the liguid-air surfaces tend to be spherical.\n\nI hope it helped.\nHave a nice day!
146786
Well this depends on what you mean by bubbles in your urine. Do you mean \n\na. You notice bubbles in the toilet after urinating? This could be normal (liquid hitting liquid, causing temporary bubbles) or if the bubbles tend to remain and are frothy with a bluish tinge, this may possibly mean too much protein in your urine (not a good thing), and could indicate kidney disease. Make an appointment to see your physician VERY SOON.\n\nb. or do you mean you notice bubbles in the stream of urine as it is leaving your urethra? If so, this is more serious as the first answerer suggests. This could indicate "pneumaturia" (air in the urine), and could be from what's known as a enterovesicular fistula (an ABNORMAL connection between the urinary bladder and the gastrointestinal tract). These are several causes for this. I won't go into details, just know that it is very seriousl. If THIS is what you are talking about. YOU NEED TO BE SEEN BY A PHYSICIAN AS SOON AS POSSIBLE. LET ME SAY THIS AGAIN. SEE A DOCTOR NOW.\n\nFor those of you who are calling the asker stupid, let me inform you that you are in fact idiots. Kindly refrain from answering medical questions if you don't know what you are talking about. If your insensitive answers causes this person to delay seeking treatment it could lead to a more serious situation.
735301
For a bubble to exist, the surface tension of the bubbles surface (interior and exterior surfaces) is in a delicate balance with the liquid sandwiched between the two surfaces. When you touch the surface of a bubble with something dry, it can, though doesn't always, disrupt the surface tension allowing a hole to form. Once a hole forms, the air, which is under a light pressure, rushes out as the surface tension seeks to reduce the surface area or the liquid forming the bubble - collapsing the bubble.
801652
This is really a trick question.  The contents inside a closed (pressurized) can or bottle contains two phases.  The lower phase is a liquid solution and the upper phase is pressurized gas containing a high percentage of carbon dioxide (this is a gas solution).\n\nWhen the container is opened, the pressurized gas excapes into the atmosphere and upon doing so allows a change to take place in the solution below.  The chemical change is:\n\nH2CO3 (aq) --> H2O (l) + CO2 (g)\n\nThe gas bubbles of carbon dioxide form inside the liquid solution, turning it into a mixture (I doubt that the term mechanical has much meaning here).
172854
Gasses are more soluble in liquids at lower temperatures.\nThis is why a soda will say carbonated longer in a cold refrigerator than out in the hot sun.  The carbon dioxide dissolved in the water will come out of solution quicker at higher temperature, the same thing for Oxygen.
269454
The gas is turned into liquid by compressing it and well mixed up with water. When we shake the soda it turns back to gas and hence needs more room than it has.
936355
It's due to air bubbles (really small ones) forming in the water and rising to the surface of the cup.  It doesn't have to be tea, hot water from a tap will do the same thing - \n\nFill a cup with really hot water from the tap and then tap the bottom of the cup inside with a teaspoon.  Keep tapping and the tone rises as the air bubbles in the water naturally rise to the surface.  Once all the bubbles have gone and the liquid is totally clear the tone will remain constant.  The same thing happens in a cup of tea, it's just that you can't see the bubbles !