Separation by evaporation – Clip

The video explains why, despite the abundance of water on Earth, many people struggle to find drinkable water. Most of Earth's water is salty sea water, which is not suitable for drinking. The video introduces the desalination process, which removes salt from sea water. It describes how heating salt water causes evaporation, leaving salt behind, and how the water vapor is collected and condensed into fresh, drinkable water.

Why is it difficult for many people to find drinkable water on Earth?

• Most of the water is underground.

• Most of the water is salty sea water.

• Most of the water is polluted.

• Most of the water is frozen in glaciers.

What is the main purpose of desalination?

• To increase the salt content in water.

• To convert water into ice.

• To remove salt from seawater.

• To purify polluted water.

What happens to salt water during the desalination process?

• It is mixed with fresh water.

• It is frozen to remove salt.

• It is filtered through sand.

• It is heated to evaporate the water.

What is collected and condensed back into liquid during desalination?

• Minerals

• Water vapor

• Impurities

• Salt crystals

What is the final result of the desalination process?

• Mineral-rich water

• Salt water

• Polluted water

• Salt-free water