Molecules in motion > sound

Echoes are used outdoors to estimate the speed of sound. Good weather has to be ordered at the same time as the equipment!

This compares the speed of sound at different pressures and in different gases.

An oscilloscope is used to time a pulse of sound travelling from a speaker to a microphone.

An oscilloscope is used to find the time of travel of a pulse of sound generated by its time-base.