There is ample everyday evidence that plasmas produce light; the sun, street lights, fluorescent lamps and the highly organised light sources in plasma TVs.
About 15 years ago the word 'plasma' entered the popular vocabulary as a type of flat video screen, though the concept is much older. According to sales figures only a small percentage of TVs today use true plasma displays, but for some time to come people will talk generically of 'plasma screens'.
Most people have seen and heard plasmas too in the form of lightning channels, sparks and electric welding arcs. In fact highly organized plasma sound sources (plasma loudspeakers) predate plasma screens, though they are still waiting in the wings for their day to come. In the meantime, it is interesting to trace the process by which electric current in a plasma becomes music to your ears.
An audio demonstration is included in the talk.
Talk begins at 7.30pm. Free parking near the lecture theatre.