Water Cycle – Dew for Primary 4

Hello, young learners! Welcome back to Primary 4 Basic Science & Technology. In our previous lesson, we learned about the formation of rain. Today, we’re going to learn about the WATER CYCLE – DEW.

Objectives

By the end of this lesson, you should be able to:

• Define dew and explain how dew is formed.
• Show appreciation for the role of dew in the natural environment.
• Illustrate the process of dew formation on a diagram.
• Collaborate in groups to discuss the importance of dew in ecosystems.

Water Cycle – Dew

Dew is a natural phenomenon that we often see in the early morning or evening. It’s the tiny droplets of water that appear on surfaces like grass, leaves, and even cars.

What is Dew?

Dew is simply water that has condensed from the air onto a surface. Condensation is the process where water vapor in the air changes into liquid water.

Formation of Dew

Here’s how dew forms:

1. Warm air holds moisture: During the day, the sun warms the air, allowing it to hold a lot of water vapor.
2. Cooling at night: As the sun sets, the air starts to cool down.
3. Condensation: When the air cools enough, it can’t hold all the water vapor anymore. The excess water vapor turns into liquid water droplets.
4. Dew formation: These droplets form on surfaces that are cooler than the air, like grass and leaves.

Think of it like this: when you take a cold drink out of the fridge, water droplets form on the outside of the glass. This is because the cold glass cools the air around it, causing the water vapor in the air to condense into liquid water.

Evaluation Questions

Now that you’ve learned about dew, let’s see if you can answer these questions:

1. What is dew?
2. How is dew formed?
3. Why is dew important for plants?
4. Can you think of other examples of condensation besides dew?
5. How does dew contribute to the water cycle?

Conclusions or Summary

Today, we learned about dew and how it forms through condensation. Dew plays an important role in the environment, providing moisture for plants and contributing to the water cycle. Remember, dew is a fascinating example of how nature works! Don’t forget to check the comments section if you have any questions, and use the navigation to move to the next lesson. See you in the next lesson!