Below the surface
When water boils, bubbles form due to the release of water vapor from the liquid. These bubbles contain water vapor, not air. The water itself does not disappear; it is transformed into water vapor, which you see as bubbles.
Water vapor (steam) is inside the bubbles that form inside boiling water. The bubbles that form prior to boiling are mostly dissolved gases escaping from the water.
When water boils, the bubbles are made of water vapor. Water is changing from the liquid phase to the gas phase, but it doesn't change all at once, so you get bubbles of gas inside the liquid. The phase change will happen first at the location where heating is taking place, so if you have a pot on a stove, the bubbles will form at the bottom of the pot, and then rise to the top.
When water boils, bubbles of water vapor form and tend to rise to the surface. This is because the vapor is less dense than the surrounding liquid water. As the bubbles rise, they expand due to decreased pressure at the surface, eventually breaking free and releasing steam into the air.
The bubbles in boiling water are made of water vapor, which is the gaseous form of water. As the water heats up, it turns into steam and creates bubbles that rise to the surface and eventually burst.
well it depends if you boil it over a fire sometimes bubbles do occur but if your just heating it at a temperature lower than boiling than it just slowly evaporates like regular water in a lake
when any liquid BOILS the bubbles just contain the same substance, but just as a gas.now why did I put 'boils' in capitals?you know if you boil water there are tiny bubbles already forming before it is actually boiling. these are the gasses which were dissolved in the water.
When water boils the gasses which where absorbed are liberated and they expand as a result of the heat causing bubbles which then rise to the surface upon further heating it would be the water turning to steam that expands into bubbles, that is why the bubbles only form at the point of contact with the heat source. there could be some oxygen in the bubbles but it would be extremely small amounts as the heat does not split the bond between the oxygen and the hydrogen.
hot air. ^^Close. It is actually steam or the gaseous form of H2O (water). As the water is heated it changes from a liquid to a gas. Since the heat is coming from the bottom (in a pot) and the top of the water is cooler, the gas forms bubbles.
When water boils, it forms bubbles of water vapor. This happens because the heat energy makes the water molecules move faster and break free from the liquid, turning into gas. The bubbles you see are the water vapor escaping from the liquid water.
Yes. When water boils, many bubbles appear. (212 degrees F)
Boiling is not as fine a process as it might seem. Evaporation increases gradually until boiling is reached. Boiling occurs when there is sufficient heat to immediately turn the water to its gaseous state. The bubbles you see forming at the bottom of a pot for example are water vapor having been boiled to gas and tend to form at the bottom because that is where it is hotter- near the heating source. You'll see steam coming off of heated water but the bubbles that are forming during boiling are water being turned to gas. Essentially the bubbles are a less intense form of boiling. As you get hotter water the bubbles will form more rapidly and will "boil" as you're more familiar with it.