Chapter 8. A Journey through States of Water Class 6 Science Curiosity [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 6 Science Curiosity are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important Chapter 8. A Journey through States of Water with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 6 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science Curiosity.
Class 6 English Medium Science Curiosity All Chapters:
Chapter 8. A Journey through States of Water
1. Chapter Review
Chapter 8. A Journey through States of Water
Water is one of the most important natural resources on Earth. It exists in three different states—solid, liquid, and gas. This chapter explains how water changes from one state to another through heating and cooling, the processes of evaporation and condensation, the cooling effect of evaporation, cloud formation, and the water cycle. These chapter review notes are prepared for quick revision according to the latest NCERT Curiosity textbook and CBSE pattern.
Chapter Review
This chapter review provides a quick summary of all the important concepts, definitions, properties, scientific terms, and applications covered in the chapter. It is useful for last-minute revision and examination preparation.
Introduction
Water is essential for all living organisms. It is the only common substance that naturally exists in three physical states—solid (ice), liquid (water), and gas (water vapour). These states continuously change into one another due to heating and cooling, making water an important part of many natural processes such as rainfall and the water cycle.
What are the States of Water?
Water exists in three different physical states. Although their appearance and properties are different, all three are forms of the same substance.
| State | Example | Main Characteristic |
|---|---|---|
| Solid | Ice | Fixed shape and fixed volume |
| Liquid | Water | Fixed volume but no fixed shape |
| Gas | Water Vapour | No fixed shape and no fixed volume |
Properties of Different States of Water
Each state of water has its own unique properties that help us identify and distinguish it from the others.
| Property | Ice | Water | Water Vapour |
|---|---|---|---|
| Shape | Fixed | Takes the shape of the container | No fixed shape |
| Volume | Fixed | Fixed | No fixed volume |
| Flows | No | Yes | Yes |
| Spreads | No | Very little | Spreads in all directions |
Important Definitions
The following definitions are frequently asked in school examinations and should be remembered carefully.
| Term | Definition |
|---|---|
| Evaporation | The process of changing liquid water into water vapour. |
| Condensation | The process of changing water vapour into liquid water. |
| Melting | The conversion of a solid into a liquid on heating. |
| Freezing | The conversion of a liquid into a solid on cooling. |
| Humidity | The amount of water vapour present in the air. |
| Water Cycle | The continuous movement of water between the Earth's surface and the atmosphere. |
Changes of State
Water changes from one state to another when heat is supplied or removed.
| Process | Change | Cause |
|---|---|---|
| Melting | Solid → Liquid | Heating |
| Evaporation | Liquid → Gas | Heating or room temperature |
| Condensation | Gas → Liquid | Cooling |
| Freezing | Liquid → Solid | Cooling |
Factors Affecting Evaporation
Evaporation takes place continuously, but its speed depends upon different environmental conditions.
| Factor | Effect |
|---|---|
| High Temperature | Increases evaporation. |
| Large Surface Area | Increases evaporation. |
| Wind Speed | Increases evaporation. |
| High Humidity | Decreases evaporation. |
Cooling Effect of Evaporation
During evaporation, water absorbs heat from its surroundings before changing into water vapour. As heat is removed, the surrounding surface becomes cooler.
Examples:
- Sweating cools our body.
- Water remains cool in an earthen pot (matka).
- Hand sanitiser produces a cooling sensation.
- Sprinkling water on the floor during summer cools the surroundings.
Condensation in Daily Life
Condensation occurs when water vapour comes in contact with a cold surface and changes back into liquid water.
Examples:
- Water droplets on a cold glass.
- Dew drops on grass.
- Water droplets on the lid of a boiling vessel.
- Fog on mirrors after a hot bath.
Cloud Formation
Water vapour rises into the atmosphere due to evaporation. At higher altitudes, the air becomes cooler. Water vapour condenses around tiny dust particles to form clouds. When water droplets become heavy, they fall as rain, snow, or hail.
Water Cycle
The water cycle is the continuous circulation of water in nature. It ensures that water keeps moving between the Earth's surface and the atmosphere.
| Stage | Description |
|---|---|
| Evaporation | Water changes into water vapour. |
| Condensation | Clouds are formed. |
| Precipitation | Rain, snow, or hail falls on the Earth. |
| Collection | Water collects in rivers, lakes, oceans, and groundwater. |
Applications
The concepts of this chapter are useful in everyday life as well as in science.
- Drying of clothes.
- Preparation of common salt from seawater.
- Cooling of the human body by sweating.
- Storage of cool water in earthen pots.
- Formation of clouds and rainfall.
- Food preservation using pot coolers.
- Weather forecasting.
- Understanding the natural water cycle.
Important Terms
Remember the following scientific terms for quick revision.
| Scientific Term | Meaning |
|---|---|
| Solid | State having fixed shape and fixed volume. |
| Liquid | State having fixed volume but no fixed shape. |
| Gas | State having neither fixed shape nor fixed volume. |
| Water Vapour | Invisible gaseous form of water. |
| Humidity | Water vapour present in air. |
| Melting | Solid changes into liquid. |
| Freezing | Liquid changes into solid. |
| Evaporation | Liquid changes into gas. |
| Condensation | Gas changes into liquid. |
| Water Cycle | Continuous movement of water in nature. |
Chapter Highlights
The following points summarise the complete chapter for quick revision.
- Water exists in solid, liquid, and gaseous states.
- Ice, water, and water vapour are forms of the same substance.
- Heating and cooling change the state of water.
- Melting converts solid into liquid.
- Freezing converts liquid into solid.
- Evaporation occurs even at room temperature.
- Condensation forms water droplets from water vapour.
- Temperature, wind, humidity, and surface area affect evaporation.
- Evaporation produces a cooling effect.
- Clouds are formed due to condensation.
- Rain is a result of condensation and precipitation.
- The water cycle maintains the continuous movement of water on Earth.
- Scientific observation and experimentation help us understand natural phenomena.
- Water is a precious natural resource and should be used wisely.
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