Has anyone set-off (lit !) a bag containing hydrogen in a lab ? Also, any suggestion, of exciting demos of combustion ? Thanks

Peter Sigsworth

The bottle can be partially filled with one gas, sealed and then the other introduced. Really straight forward. :cool: Then using water pressure the gasses are forced into the balloon. ;)

If you only require H2 my conical flask cuts out the middle man as such. A simplified procedure.
I like our method - will try it
In the past we've used emptied out egg shells - good for science shows etc where you might have a young / nervous audience as you don't get a big bang, just egg shell everywhere. Has a certain amusement value to it!