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Aldi-LIDL Specials - Megathread!
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Kaisr Sose wrote: »Are Aldi doing Chemistry Sets ?
Well, given your expressed interest in Chemistry (don't try to back out now), the tendency for oxygen to hog a bit more of the electrons that it's sharing with the carbon, making the oxygen slightly negative and the carbon slightly positive, is also the reason you can get cheap foggy effects in stage shows and old movies: carbon dioxide forms a solid (dry ice) at a relatively high temperature, and it turns straight back into a gas at standard temperature and pressure.
See the carbon atoms and oxygen atoms pointing at each other in this Wikipedia schematic diagram of solid carbon dioxide:
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Well, given your expressed interest in Chemistry (don't try to back out now), the tendency for oxygen to hog a bit more of the electrons that it's sharing with the carbon, making the oxygen slightly negative and the carbon slightly positive, is also the reason you can get cheap foggy effects in stage shows and old movies: carbon dioxide forms a solid (dry ice) at a relatively high temperature, and it turns straight back into a gas at standard temperature and pressure.
See the carbon atoms and oxygen atoms pointing at each other in this Wikipedia schematic diagram of solid carbon dioxide:
Agh, so right. Nothing like a bit of chemistry in the pale moon light :-)0 -
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magicbastarder wrote: »i dunno about this claim about nitrogen needing a heavy pressurised vessel. the physics faculty in UCD had (has?) a liquid nitrogen plant and you could just pop down and pick up a flask of it without so much as a by-your-leave. was great fun to play with.
that said, might be impractical to carry it around on the bike with you.
your ride could end badly too:
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your ride could end badly too:
That nitrogen isn't/wasn't pressurised, just liquid as it is so cold as the energy is constantly drawn off to keep it cold and therefore in liquid form.
The CO2 cannister is pressurised to make the gas into a liquid, it doesn't have a cooling system with it. When pierced the pressurised liquid vents, takes energy (heat) from the atmosphere to become it's natural state at room temp (gas). Which is why the cannister gets really cold.
You can't do this with nitrogen as it massively expands compared to CO2 at room temp, so the internal pressure of a nitrogen cylinder would far exceed a standard gas cylinders ability to withstand. BANG!
This is why all the nitrogen trucks and storage facilities are directly vented to atmosphere (and painted white to reflect heat), a couple of degrees increase in heat means the volume of nitrogen increases by 30%, so if the cooling fails there is not a dangerous pressure build up.
You'd need a 2kg cyclinder to carry 16g of nitrogen compared to the current one.0 -
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