I've just had a funny and weird experience.
Have you ever noticed a peculiar sound this flame produces? It's rarely quiet.
I've just burned some hydrogen in 1L flask to take some nice photos, and there was this weird WOOOOOOO sound. Kind of the sound of microphonics, but
low pitched.
I uploaded the video so check for yourself.
<iframe sandbox width="480" height="390" src="http://www.youtube.com/embed/nUzugUuwFVA" frameborder="0" allowfullscreen></iframe>
(sorry about the crumbled background)
Touching the flask does nothing, so does covering the neck, and the lower the flame is positioned in the flask, the louder the sound. And it can be
really, really loud. It got so fun dipping the flame that I forgot it was midnight so I woke up some people on the upper floor, made them come down
and use foul language.
Putting hand above the neck of the flask (hydrogen chloride mist comes out; well what the heck, you live only once, and I've got some hand lotion to
soothe the pain) reveals tingling vibrations of the air column.
What the hell just happened? It's just warm HCl exiting a flask. Mind that this happens in smaller flasks, too.
I think it's some kind of resonance between the flame and the warm gas exiting the flask neck, because as soon the sound is made, the flame gets all
messed up. It reminds me of Ruben's tube.
Now I'd like to try this with a much larger container. |