Cloud in a Bottle

The video tutorial explains how clouds form and demonstrates a simple experiment to create a cloud in a bottle using warm water, a plastic bottle, and smoke from a splint. The process of nucleation is described, where smoke particles provide surfaces for water vapor to condense into droplets, forming a cloud. The video also discusses cloud seeding, a technique used to induce rain by adding substances like silver iodide to the atmosphere, highlighting its use in China to increase rainfall in dry regions.

What is the purpose of using a plastic bottle in the cloud experiment?

• To store the smoke

• To create a sealed environment

• To heat the water

• To measure the temperature

Why is warm water used in the cloud experiment?

• It reacts with the smoke

• It prevents the bottle from collapsing

• It cools the air inside the bottle

• It evaporates quickly, saturating the air with water vapor

What role does the smoke from the splint play in the experiment?

• It increases the pressure inside the bottle

• It heats the water

• It provides surfaces for water vapor to condense on

• It changes the color of the cloud

What happens to the pressure and temperature inside the bottle when it is squeezed?

• Pressure decreases and temperature increases

• Pressure increases and temperature decreases

• Both pressure and temperature increase

• Both pressure and temperature decrease

What is nucleation in the context of cloud formation?

• The formation of ice crystals

• The process of heating water

• The gathering of water molecules around particles

• The evaporation of water

What is cloud seeding and why is it used?

• A process to create artificial clouds for shade

• A way to reduce air pollution

• A technique to increase rainfall by adding substances to the atmosphere

• A method to prevent rain

Which chemical is commonly used in cloud seeding to induce rain?

• Sodium chloride

• Calcium carbonate

• Silver iodide

• Potassium nitrate