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02-11-10, 11:54 AM
Join Date: Jul 2009
Originally Posted by
Not had a chance to look at the images yet Karen, but you dont really want to mess with liquid nitrogen - it's something like -196 degC and you certainly dont want to spill any. I remember A-Level Physics and the teacher spilling a small amount on the table - which promptly split!
You could probably buy it from any serious pharmaceutical outlet - wholesale that is - but I would imagine it's controlled/licensed in some way...
Actually, its not that dangerous, if you know what you're doing. I use it on a nearly daily basis. You'd have to have either a lot of LN2 or a damage table to split it. You can (carefully and slowly) pour some into your hand and hold it - it boils so quickly that you don't harm yourself. Again, its worth stating that you need to know what you're doing with it though...
It's not actually a regulated product either, at least not to buy. You have to be licensed to sell it and most places that do, won't sell it to individuals that don't have an obvious need for it.
From a professional perspective, LN2 is covered under the
Control of Substances Hazardous to Health (COSHH)
regulations as well as the
Pressure Systems Safety Regulations
The bigeest problem with it is actually storing it. It "lives" at between -196 and -204(ish) degrees Celsius (it boils at -196 so, to remain liquid, it has to be colder than that) and it's a bloomin' nightmare without proper dewars. I know people look like they use Thermos flasks - they don't they're special dewars. Pour some in a Thermos and you'll shatter the inner glass.
Also.. great pictures. I'm geniunely impressed with these!
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