Here's a Question! - Why Does the Water Rise?
Рет қаралды 5,038
11 ай бұрынWhen a lit candle that's placed in a shallow tray of water is covered with a beaker, the candle goes out and the water in the beaker goes up. What happens when three candles are used?
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#combustion #airpressure #heresaquestion
@raymonko 11 ай бұрын
My guess was that same amount of oxygen is consumed not taking in consideration other factors like vapour and co2. This was very different outcome than what I anticipated! Well presented!
@AdityaMehendale 11 ай бұрын
If I get a chance, I'll try igniting the candle(s) inside the beaker, so that the "preheating" does not play a role. Nice demo!
@evvqx 11 ай бұрын
Glad to see new videos. Great video Steve and Joanna!
@Qermaq 11 ай бұрын
Fire and beakers. What's not to love?
@Layarion 6 ай бұрын
my first guess was "it'll be the same because only so much oxygen" so i was surprised.
@DoughBoyz97 11 ай бұрын
Interesting
@thenatureofnurture6336 11 ай бұрын
Great format to the videos. I can see how these will produce great analytical minds.
@PerspectiveEngineer 11 ай бұрын
Wow that was really fascinating
@ESSBrew 11 ай бұрын
Love all your videos for years!
@TheOtherBill 11 ай бұрын
Me too, came for the liquid nitrogen fun, stayed for the mental exercises.
@JeffersonLab 11 ай бұрын
Thanks for all your support!
@NekuraCa 11 ай бұрын
How about putting the beaker over unlit candles, then light them with a spark or laser?
@edu7921 11 ай бұрын
What will happen if we take that boiled water instead of normal one. I suppose it would give less rise in height. Bcz the expanded air is getting contracted by transferring heat to water thus decreasing the pressure and height rise. So if we take boiled water then air will be contracted less bcz of less amount heat transfer when temperature difference is low in case of boiling water. So in this case it must rise less than earlier. We can also take cold water also then it may give more rise to its height for the same reason.
@sujaydhanush1596 11 ай бұрын
liquid increase and its speed depends on thermal expansion
@ESSBrew 11 ай бұрын
I think there is a max amount of candles that creates a temperature gradient vs total oxygen available at its best potential, after that, no more candles would help.
@hughobyrne2588 11 ай бұрын
A variation of the experiment would be to have a beaker-shaped cylinder, without a 'bottom', around the candles, then quickly slide a top horizontally onto it. This would reduce the effect that you mention, that the beaker is trapping hot air as it's being lowered.
@JeffersonLab 11 ай бұрын
This experiment actually has a fairly lengthy history. Apparently, Lavoisier tried using this set-up to measure how much oxygen was present in the air, but eventually abandoned it due to some of the complications we mention. His solution was to replace the water with mercury and to light the candle with the 'beaker' in place: "In the middle of a glass stand, was placed a small wax candle; and on the top of the wick was fixed a small piece of Kunckel's phosphorus. The stand was then placed in a basin of mercury and covered with a jar. I made a piece of iron wire red hot then passed it through the mercury, set fire to the little piece of phosphorous, and by this means the candle was lighted."
@dirtymike4894 11 ай бұрын
@@JeffersonLab Lagrange was wrong. Sadly, France still hasn't grown another head like Lavoisier.
@Jagjamin 11 ай бұрын
I was so certain it was going to be B, this is the first I was wrong on.
@NothingBootz 11 ай бұрын
I though CO2 to be more dense than loose 0 gas. C is a solid at room temperature, and at that high burn/convert temperature it steals 2 O atoms and binds is closer to C atoms/molecules. Taking less space. Basicly burnt Carbon as a binding agent to loose O gas, that would occupy much more space without the carbon vanderwaals suction
@Sartorri4666 11 ай бұрын
It's the added heat from the extra candles. I think you'll find more condensation in the beaker that burned hottest and fastest.
@Lady8D 8 ай бұрын
I love being surprised/wrong. My assumption was that the three would go out faster but the same amount of water would rise. Tried to pause after seeing that with 3 candles the amount of water seemed to triple (didn't measure, just eyeballed) and she guessed maybe it was the candles themselves displacing some of the space for the water to fill in but I think the amount of space the candles take up is too small to account for the difference seen. I like the reasons given at the end and hope to see more definitive answers in the future 😊
Jefferson Lab
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