A “bell in a bell jar” is primarily an educational apparatus demonstrating that sound needs a medium (like air) to travel; by ringing a bell inside a sealed jar and pumping the air out, the sound fades because there are no air particles for the sound waves to vibrate through, proving sound can’t travel in a vacuum, with related uses including vacuum experiments for air resistance and chemistry.
Description
A “bell in a bell jar” is primarily an educational apparatus demonstrating that sound needs a medium (like air) to travel; by ringing a bell inside a sealed jar and pumping the air out, the sound fades because there are no air particles for the sound waves to vibrate through, proving sound can’t travel in a vacuum, with related uses including vacuum experiments for air resistance and chemistry.
