How did Robert boyle demonstratebthe sound waves cannot travel through empty space?

Robert Boyle demonstrated that sound waves cannot travel through empty space by conducting experiments using a vacuum. He used a bell jar and a vacuum pump to remove air from the jar, which contained a ringing bell. As the air was evacuated, observers noted that the sound of the bell diminished and eventually became inaudible, illustrating that sound requires a medium, like air, to propagate. This experiment provided clear evidence that sound cannot travel in a vacuum, as there were no air particles to transmit the sound waves.