Eli5: How does sound pass through closed doors or through fabric? For example under a blanket?

Question

Eli5: How does sound pass through closed doors or through fabric? For example under a blanket?

In: Physics

Answer 1

Sound is just vibrations – the air outside vibrates the door, which vibrates the air on the inside ~|~ It’s quieter on the inside because the door absorbs some of the energy instead of passing it on