what causes bubbles in boiling water?
150532
The bubbles are steam, or water vapor.  They are NOT from hydrogen and oxygen.
90779
c basically boiling of a liquid means the vapour pressure[pressure created at surface] equals the atmospheric pressure.the increase in vapour pressure is due to the fact that the kinetic energy of molecules movin thermal velocities because of increase in temp. therefore for some molecules the time taken by molecules to achieve this situation is faster as the molecules have diff forces of attraction .hence to break the forces and achieve the above situ. is diff for diff. liquids \n\n\nhope this is satisfactory any more queries  mail me
1052162
On paper that has to be the answer but there is a concept of heat loss when boiling water comes in contact with cold water.\nThe loss is in the nature of steam. \nSteam is at a the temperature of boiling water. \nSo there is a loss of heat. The cold water ends up being less in quantity due to steam loss. \nSo the cold water cannot offset the heat of the boiling water, so the temperture will be higher than that of 50 Degrees.
68409
Okay inside the curnal there is some moisture. And when it heats up the water expands and causes steam so when this happens there becomes less and less room inside the curnal and eventually explodes. Thus causing popcorn to pop.
124074
In short: Any solution will boil at a higher temperature than the pure solvent. \nBoiling point elevation is a colligative property. Use the formula provided by emilyrose. The addition of salt to water causes vapor pressure reduction of the water. This is because the addition of a non-volatile solute causes a reduction in the surface area available to water molecules, reducing the likelihood of evaporation. This vapor pressure lowering is described by Raoults Law (see link).\nInterestingly, if you have a salt solution, and you heat it till it boils, as the water evaporates, the boiling temperature of the solution will continuously increase, because its molality increases. Please see the link below for a more detailed discussion.
52371
Yes, you can boil water in the microwave.  If you boil water in the microwave you won't see it bubble. So, it may be at boiling temperature but will not produce the bubbles associated with boiling on a stove.  This can actually cause the water to become superheated (above 212 F) because it is not bubbling.  If superheated water is removed from a microwave, it can spontaneously begin to boil out of the container, which can result in severe burns to the hands and face. The addition of a wooden stick (or similar object) helps to keep enough bubbles forming to prevent the water from becoming superheated.\n\nPart of the Contents courtesy of eHow, http://www.ehow.com/how_2297_boil-water-microwave.html
897563
It could be too much oxygen in the water you're boiling.  Here's a tip, only use fresh water to make tea and only boil it once.  By boiling the water repeatedly, you're oxygenating it.  This could explain your bloatedness.  It could also be the type of milk you're using, try skimmed milk instead of full fat.
22677
The bubbles contain water steam. Steam is a transparent gas, the white mist you can see above chimneys isn't steam but recondensed water in fine droplets, just as in fog or clouds.
899395
What you are seeing is surface tension.  Water molecules have an attraction to each other.  They sort of "hold on" to the water molecules allowing the level to rise without spilling over.  \n\nIf you create the bubble by adding pennies and add a drop of dish detergent you will see that the soap breaks that surface tension and the water will spill.
869654
the heat from the boiling water will cause the air in the ball to expand thus pushing the dent and removing it
666167
Good question.  I have noticed it but have never put a lot of thought into the phenomenon.  Now that you have mentioned it, I too would like to find out why.\n\nIt is not the actual boiling of the water; it occurs just prior to boiling.  I wonder if the molecules at the hottest point (just above the bottom of the pot) have gained enough energy and begin to expand into small bubbles of steam but as they rise, they loose energy to the molecules higher up and in so doing, they implode.  The resulting sound is what is heard.\n\nOr there could be some kind of resonance as many areas suddenly turn to vapour IN THE water.  Just a few thoughts.
974753
Water inside the kernel boils and increases the pressure inside, to the point that it is greater than the pressure outside. When the structure of the kernel can no longer maintain the pressure difference, it pops.
1121666
A tea kettle makes noise because of the air inside of the kettle expanding due to the increased heat.  Most of this heat comes from the water's increasing temperature, since the water is closer to the heat source than the air.\n\nWater reaches boiling point at 100º Celcius.  Water does not instantaneously go from liquid to gas though.  It requires a good deal of energy before it goes from a liquid to a gasous state, more energy even than raising it's temperature from room temperature to 100º C.  While this energy is building up, the temperature of the water is not rising, the molecules are merely breaking apart from each other.  Since the temperature is not rising anymore, the air in the kettle is not expanding, and therefore, no noise.
968042
Boiling is vapour pressure phenomenon. A liquid always exerts a pressure in the space just above it due to evaporation of its surface molecule which is called vapor pressure of that particular liquid and as temperature is raised the vapour pressure goes on increasing. When vapor pressure of the liquid exceeds atmospheric pressure liquid starts to boil.\nin case of a mixture, the solute molecules bind the molecules of the solvent and thus there are fewer surface molecule available to evaporate from the liquid surface. Due to which vapour pressure exerted by a mixture is always less than vapor pressure of pure solvent. To make vapor pressure of mixture to reach the atmospheric pressure level its temperature should be raised more than temperature of solvent alone. Thats why a mixutre has a boiling point elevation.
1420
Good question.   Could be a number of reason, but my guess would be that you have some salt in your boiling water.    When NaCl solution is placed in a flame the Na cation gets ionized and yellow light is given off.    It doesn't take much salt for you to see this effect.   You will see this even with regular tap water, since it also has a small amount of salts dissolved in it.    \nIn fact, standard distilled water is usually not pure enough to avoid this effect.    That's why chemist buy special stills to make ultrapure water for experiments.
562769
The  rough edges of  an anti-bumping granules prevent bumping when you boil a liquid.\nWhen you boil a liquid in a vessel,bubbles of vapour form around rough areas. \nIf a liquid is boiled in very clean, smooth glassware it can be difficult for bubbles of vapour to form. Suddenly, one large bubble of vapour forms disturbing the boiling liquid violently. This causes bumping, and is hazardous.\nSo to avoid this bumping you need to add anti-bumping granules.\n\nNote: Small broken glass pieces, put inside the flask before boiling, can also act as a anti-bumping agent.
345993
Although adding salt to water will raise the boiling point, you will need to add a lot of salt.  If this is water that will be used for cooking anything, it will ruin it.  For example, to raise the boiling temperature 1/2 degree celsius, requires 1/4 Cup of Salt!\n\nWhen a pot is boiling over, just turn down the heat or remove it from heat.  You could add some salt, which will change the vapor pressure and slow down the boiling process, but it takes a lot.