Where does the air come from?
2007-01-30 04:32:23 · 7 answers · asked by bafler2005 1 in Science & Mathematics ➔ Chemistry
this is actually a very good question because there are a lot of people who think the hydrogen bonds in H2O are broken when you boil water. All that is happening is that water is changing form from liquid to vapor. It's also where the steam comes from - it's just this steam comes from the bottom of the pan where things are the hottest.
It takes A LOT of energy to break the bonds in water and get elemental hydrogen and oxygen. you normally use electrolysis for that.
2007-01-30 04:58:55 · answer #1 · answered by shiara_blade 6 · 1⤊ 0⤋
Its unbelievable how many people think water is broken into elemental hydrogen (which is also a gas, Enstiens) and oxygen when boiled. Boiling is a PHYSICAL PROCESS, which you would know if you people knew even the slightest bit about chemistry. Please refrain from answering questions and confusing people about the real answer if you have no idea what you are talking about.
Here's the actual answer.
Along the bottom of the pan (or whatever you are boiling in) there are small holes which trap a small amount of water. Since this water is basically a small sphere, which is touched almost all sides by metal, which is given much more heat, than other portions of the water in the pan. Because of this, this water is given the required energy to vaporize before other parts of the water. Thus it boils from the bottom up.
Water vapor is much less dense than liquid water and thus is rises to the surface and forms the bubbles you see.
2007-01-30 04:46:23 · answer #2 · answered by Ross P 3 · 2⤊ 2⤋
Initially when we heat water, the dissolved gases like oxygen, carbon dioxide and nitrogen will appear as tiny bubbles. How else will the fishes (and aquatic life) breathe if there is no dissolved oxygen?
When water is boiling at 100 deg C...then the bubbles are bubbles of steam at 100 deg C. The vapour (steam) in the bubble is saturated water vapour at 100 deg. C.
The pressure in the saturated water vapour is called saturated vapour pressure (s.v.p). Hence we define boiling as that temperature when the s.v.p. is equal to the external atmospheric pressure.
2007-01-30 04:48:39 · answer #3 · answered by pete 2 · 2⤊ 0⤋
Some air will come out solution as the water gets hotter, but it's mostly steam.
2007-01-30 04:43:17 · answer #4 · answered by Iridflare 7 · 1⤊ 0⤋
The oxgyen in the H2O bond:
the water contains air and the air in the water is heated. It expands enormously when it touches the hot bottom of the pot. Immediately bubbles rise to the top of the water and these expanded bubbles are absorbed again into the air above the water level
2007-01-30 04:38:57 · answer #5 · answered by Diamond in the Rough 6 · 1⤊ 4⤋
Its the oxygen in the water,When I get a bath my bubbles come from bubble bath luv them.
2007-01-30 04:45:36 · answer #6 · answered by Ollie 7 · 0⤊ 3⤋
the air trapped in the water..
2007-01-30 04:53:48 · answer #7 · answered by nicklelinea 1 · 0⤊ 2⤋