It’s always great when a student or a teacher sends along a report, picture or a video of something cool going on in the classroom.

Or, as in this case, a cool experiment during vacation.

This is a first attempt at creating a Ruben’s standing wave flame tube showing the relationship between sound waves and air pressure. It looks quite hazardous and not to be tried at home without guidance, permission and precaution.

Wikipedia explains it this way – or you could just ask Jake or Preston or another physics student.