any gas volume vs field interaction?

[wimms]

I wonder if there are any gases that react to applied E/M field changes by changing their volume? Apart thermal stuff of course. I assume that piezo electrics apply to solids, but how about gases?

[Bystander]

O2 in a magnetic field (probably some others); any gas in an electric field (remember the experiment in which dielectrics are "pulled" into the field?). Anything in particular you're hunting?

[wimms]

hmm, weird. I have checked this thread, but saw no answer to it. Now I see it was answered next day. weird..

Thanks for your hint. I'm thinking about how would it be possible to produce audible sound with as direct interaction with air as possible.
What is the mechanism with O2? Electrostatic repulsion? or something else?

[Bystander]

You might browse "electrostatic speakers" for particulars on a nearly direct interaction with air. Driving air itself with E/M fields is going to take field strengths that might be beyond handling.

[Gokul43201]

How about clapping your hands ? Isn't that direct interaction with the air.