From Physics in the Pub 2016, a great set from Leon Twardy about sound waves, how microphones work, and how an acoustic guitar steals energy from the future. https://youtu.be/35uZ34Ri168
The Rubens Tube is a really complicated demo that seems simple. Once you start thinking about it you realise that sound antinodes are points of oscillating pressure, so the flames shouldn't be stable peaks - they should be going up and down at the frequency of the wave! And if you change the gas pressure … Continue reading Sound and fire = complicated!