Vacuum

Summary: The dolphins you see in Elephants stamp their feet when a lion comes near them. This warning sound travels through the ground to other elephants. Sound needs a medium like a solid, liquid, or gas to travel through. It cannot travel through empty space (known as a vacuum) because there are no particles to vibrate. Tags: science student-book-7 physics Created: 2026-05-21 Last Updated: 2026-05-21

Vacuum

The dolphins you see in Elephants stamp their feet when a lion comes near them. This warning sound travels through the ground to other elephants. Sound needs a medium like a solid, liquid, or gas to travel through. It cannot travel through empty space (known as a vacuum) because there are no particles to vibrate.

Source

This concept is from the [Science Student Book 7](Science Student Book 7/Physics/Sound/2.2 Sound.md), Physics section.