Listening to Argon Gas

[exotic]

I've noticed when I rotate sealed double glazed units, some of them make a "woosh" sound, like sand falling from one side of the glass to the other, except there is nothing visible inside.

Does this sound indicate the presence of argon gas?

 

[crank39]

It's the desicant crystals inside the spacer bar

 

[exotic]

Ahhhh thanks, crank.