true bro.... i used to swimming in them in my alma matter. hehe

try to search for their supplier using yellow pages or sumthing. but its pricey for sure

waa...so convinient if u got ur own cryogenic machine. unlimited resource
my uni wanna cut cost, so they just buy from supplier. cheaper (they said..)

erm..what the different between fractional seperation and cryogenic?

isnt it just the same thing. i still remember my last visit to PFK. there they use that fractional separation of air to get nitrogen in their fertilizer manufacturing process. since other substance (of air...) will turn to liquid before nitrogen do when they cool it down. so, they can extract high purity of nitrogen from air. these technique named as cryogenic separation...

i dunno either? but dis thing need to be stored in high pressured vessel (just like air tank which used by divers.. ). and as i remembered, poslaju wont accept this vessel because there is possibility of the vessel to blow up.