# How to Boiling Water Using Ice

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Ice in placed on a sealed FLASK and the water inside starts to boil. Great science fair experiment.
1. Find a FLASK (Something that won't crank due to pressure)
3. seal it and invert the FLASK
4. place an ice cube or two on top.
5. the condensing of the gas above the water from the ice cubes causes the water to boil

***note-after the FLASK and water cool to room temperature the heat from your hand should make it start to boil again.

Only try this under adult supervision.

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## 32 Discussions

With the cork in the flask, just waiting to the cork to blow out, or the jar explode.

Normal room temperature is 20C or so - but the water was 40C at the end (about 100F.) What's up? Molecular friction from jumping around?

But it was nearly 100C when they started.
BTW How do you know it was 40C at the end? I didn't see a thermometer anywhere.

near vacuum the boiling point keeps going down with the pressure it's what is known as the vapour pressure. the higher the temperature, the higher the vapour pressure. when the vapour pressure of the liquid rises to the atmospheric pressure above the liquid then can evaporate in the middle of the liquid because it now has enough pressure to displace the liquid against the pressure of the atmosphere trying to squeeze it together and collapse them. When you boil a pot of water the water at the bottom of the pot reaches 100C before the water near the top. water at 100C has a vapour pressure of about 15psi or 1 atmoshere so bubles of water vapour form. the bubbles start to rise and encounter water that is only 99C and the vapour cools and it vapour pressure drops to just below 1 atm it condenses into the 99C water (giving off it heat of varourization and heating up the 99C water allowing the next bubble to rise a little higher before in collapses) I don't know what the vapour pressure of water at 20C is but I would imagine it's not much more that about 0.2 atm That's fairly close to a vacuum Gordie

Wow, thats the best description so far. I was a little confused about how this actually worked. I am wondering, can this method then be used to create a Near Vacume for other experiements? For instance holding a container over a large amount of steam which has lids for the top and the bottom, and quickly closing it off on both ends while it is full of steam. Seems like that might work......Im not sure how I could get anything into it however without letting in more air, but It might be possible-for instance to somehow creatively mount whatever you need inside the chamber first, as long as it would not be effected by the heat of the steam. Am I missing a concept here or could this work to create a poor mans NV.

Sorry I took so long to notice your question.

DISCLAIMER: This is a workable concept. Weather it may be functional or dangerous would depend on materials.

If you want to use a bell jar, make a base with two holes in the bottom.
Place your specimen on a raised platform as there will be a layer of water at the bottom.
Holes need valves that are good enough to hold a vacuum (or near) and everything needs to withstand 100degC.
Attach a kettle to one valve and leave both valves open.
Place your specimen. Place the bell jar over it.
Turn on the kettle. There will be a rainstorm inside as the bell jar, base, and specimen heat up. This could take a while. Eventually the amount of water trickling out of the valves should slow and there should be steam billowing out of the exit valve.
Of course at this point EVERYTHING IS HOT ENOUGH TO GIVE YOU A NASTY BURN! (including the valves) Also by this point virtually all the air should have been replaced/displaced by steam.
Now close the valves and disconnect the kettle(so it doesn't blow up) and WAIT.
As everything cools down the steam will condense and the pressure will drop.
DON'T THROW ICE OR EVEN COLD WATER ON IT!
IT WOULD ALMOST CERTAINLY EXPLODE.
Once it gets to room temp you should have a pretty good vacuum.

Personally I would use a vacuum pump, but if circumstances make this easier for you then have fun and don't kill yourself.

Gordie.

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