@joel120193 There should be a unit that you can plug into an EHT unit to show colours of the gas when a high voltage goes across. You can also use a hand held spectrometer to see the emission spectra.
@abbyaug I have this app for my daughter it allows me to see any negative comments and what they are for so I can discuss them at home. It also allows me to praise and track positives and what they are for. I really like it.
Do you want 1 minute/day of physics history for your students? If your answer is yes, you might like the year's worth of slides I just finished. https://t.co/6CQdILDuMM Comments are turned on if you want to leave suggestions/comments. #ITeachPhysics