Science worksheets: Solids, liquids and gases. -> evaporation

What is Evaporation?

Evaporation is the process in which a liquid changes into a gas at a temperature below its boiling point. It occurs when the molecules in a liquid gain enough energy to escape from the liquid's surface and become vapor.

Factors Affecting Evaporation

1. Temperature: Higher temperatures generally lead to faster evaporation as the molecules in the liquid gain more energy.
2. Surface Area: Increasing the surface area of the liquid can also speed up evaporation as more molecules are exposed to the air.
3. Humidity: Lower humidity levels promote faster evaporation as the air can hold more water vapor.
4. Wind: Wind can carry away water vapor from the liquid's surface, promoting faster evaporation.

Examples of Evaporation

Evaporation occurs naturally in everyday life. Some examples include:

• When a puddle of water dries up after a rainstorm.
• The evaporation of sweat from our skin helps us cool down on a hot day.
• The drying of wet clothes on a clothesline.

Importance of Evaporation

Evaporation is important for various reasons:

• It is a key part of the water cycle, where water evaporates from the Earth's surface and returns as precipitation.
• It is used in industrial processes such as the production of salt from seawater and the concentration of fruit juices.
• It helps regulate the Earth's temperature by transferring heat from the surface to the atmosphere.

Study Tips for Evaporation

When studying evaporation, it's important to:

1. Understand the concept of evaporation and how it differs from boiling.
2. Learn about the factors that affect the rate of evaporation and be able to provide examples of each factor in action.
3. Be familiar with the importance of evaporation in the natural world and in human activities.
4. Practice identifying examples of evaporation in everyday life.