Small on size, big on science. In a 3-inch sphere, watch as tiny plasma filaments branch out from the central electrode to where you touch the glass creating fascinating beams of coloured light. The Science Museum Mini Plasma Ball also reacts to sound.

Sit it on your desk or shelf and watch this scientific energy lamp create flashes of miniature lightning. 

Part of the Science Museum innovative lighting range.
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Promotes STEM learning. The plasma ball is a form of Tesla Coil. The glass sphere has most of its air replaced with 3 noble gases - typically Neon, Argon and Xenon - and an alternating current electrode is placed at the centre.

When voltage is applied, plasma filaments extend from the electrode and flow towards the outer glass insulator in a bid to reach the earth. If a fingertip is placed on the glass the energy moves toward it, because the human body provides a more conductive discharge path.