Removing a certain amount of ethylene and weighing it, e.g. equalizing pressure between the large cylinder and an empty 1L bottle and calculating the
density at this pressure from the weight increase of the small bottle is definately a possible solution. The only downside is that the empty 1L bottle
(rated for 200 bar) will weigh many times more than its contents, over ten times as much, and then the resolution of the electronic scale with a range
of over 2kg determines the accuracy of this method. But it's a good idea and I'll keep it in mind.
Ideally, however, it should be possible to determine the cylinder contents without removing any of it.
[Edited on 30-5-2013 by garage chemist] |