Class 6 Science Curiosity Solutions English Medium

NCERT Solutions Class 6 Science Curiosity English Medium

Chapter 8. A Journey through States of Water

Topic: CBSE Full Notes

Chapter 8. A Journey through States of Water

Water is one of the most valuable natural resources on Earth. Every living organism depends on water for survival. We use water for drinking, cooking, washing, farming, industries, and many other purposes. One unique property of water is that it naturally exists in three different states—solid, liquid, and gas. This chapter explains how water changes from one state to another, the processes responsible for these changes, and their importance in everyday life and nature.

CBSE Full Notes

These detailed CBSE Notes are prepared according to the latest NCERT Curiosity textbook and the current CBSE competency-based pattern. The notes explain every important concept in simple language with examples, tables, and real-life applications for better understanding and examination preparation.

Introduction to States of Water

Matter exists in different physical forms known as states of matter. Water is one of the few substances that naturally exists in all three states. Ice is the solid state, water is the liquid state, and water vapour is the gaseous state. Although these forms look different, they are all made of the same substance—water.

The state of water depends mainly on temperature. When heat is supplied or removed, water changes from one state to another. These changes are called changes of state and are physical changes because no new substance is formed.

The Three States of Water

The three states of water differ in their shape, volume, and behaviour.

These three states continuously change into one another in nature due to heating and cooling.

Properties of Solid, Liquid and Gas

Each state has its own physical properties that help us identify and compare them.

Melting

Melting is the process in which a solid changes into a liquid when heated. Ice absorbs heat from its surroundings and changes into liquid water. During melting, only the physical state changes while the substance remains the same.

Examples:

• Ice cubes melting outside the freezer.
• Ice cream melting on a hot day.
• Butter melting when heated.

Freezing

Freezing is the opposite of melting. In this process, liquid water loses heat and changes into solid ice. This process takes place inside refrigerators and freezers and also in very cold regions during winter.

Examples:

• Water becoming ice in a freezer.
• Formation of ice on lakes in cold countries.
• Making ice cubes at home.

Evaporation

Evaporation is the process in which liquid water changes into water vapour. Unlike boiling, evaporation takes place from the surface of water and can occur at any temperature. During evaporation, water absorbs heat from its surroundings before changing into vapour.

Evaporation is a slow and continuous process that occurs naturally around us every day.

Examples of Evaporation

• Drying of washed clothes.
• Drying of wet roads after rain.
• Drying of a mopped floor.
• Evaporation of sweat from our skin.
• Drying of ink and paint.

Factors Affecting Evaporation

The speed of evaporation depends upon several environmental factors.

These factors explain why clothes dry faster on sunny and windy days than on humid or cloudy days.

Cooling Effect of Evaporation

During evaporation, water absorbs heat from nearby objects. As heat is removed, the surrounding surface becomes cooler. This phenomenon is known as the cooling effect of evaporation.

Examples

• Sweating cools the human body.
• Water stored in an earthen pot remains cool.
• Hand sanitiser feels cool after application.
• Sprinkling water on the floor during summer produces cooling.

Condensation

Condensation is the process in which water vapour loses heat and changes back into liquid water. This process occurs when warm, moist air comes in contact with a cold surface.

Examples

• Water droplets on a cold bottle.
• Dew drops on grass.
• Fog on a bathroom mirror.
• Water droplets on the lid of a boiling vessel.

Cloud Formation

Clouds are formed due to condensation. Water from rivers, lakes, ponds, and oceans evaporates because of the Sun's heat. The water vapour rises into the atmosphere where the air is cooler. It condenses around tiny dust particles to form small water droplets. These droplets combine to form clouds.

When the droplets become heavy, they fall to the Earth as rain. In colder regions, precipitation may occur in the form of snow or hail.

The Water Cycle

The water cycle is the continuous circulation of water between the Earth's surface and the atmosphere. It ensures that water is continuously recycled in nature.

The water cycle maintains the balance of water on Earth and provides fresh water for plants, animals, and human beings.

Importance of Water

Water is essential for life and supports almost every activity on Earth.

• Required for drinking and cooking.
• Used in agriculture and irrigation.
• Necessary for industries.
• Produces hydroelectric power.
• Maintains ecosystems.
• Supports sanitation and hygiene.
• Helps regulate climate through the water cycle.

Applications in Daily Life

The concepts discussed in this chapter can be observed in many everyday situations.

• Drying clothes after washing.
• Cooling of our body through sweating.
• Preparation of common salt from seawater.
• Formation of clouds and rainfall.
• Storage of cool drinking water in earthen pots.
• Weather forecasting.
• Food preservation using pot coolers.
• Making ice cubes in freezers.

Remember These Points

The following points are useful for quick revision before examinations.

• Water naturally exists in three states—solid, liquid, and gas.
• Ice, water, and water vapour are forms of the same substance.
• Changes of state are physical changes.
• Melting changes solid into liquid.
• Freezing changes liquid into solid.
• Evaporation occurs at all temperatures.
• Condensation is the opposite of evaporation.
• Evaporation absorbs heat and causes cooling.
• Temperature, surface area, wind speed, and humidity affect evaporation.
• Clouds are formed due to condensation.
• The Sun provides energy for the water cycle.
• The water cycle continuously recycles water in nature.
• Water is a precious natural resource and should be conserved.

Chapter Summary

Water is one of the most important substances found on Earth because it naturally exists in three different states. Heating and cooling continuously change water from one state to another through melting, freezing, evaporation, and condensation. These changes are responsible for many natural phenomena such as cloud formation, rainfall, and the water cycle. Understanding these processes helps us explain several everyday observations, including drying of clothes, cooling through sweating, and the formation of dew. The chapter also reminds us that water is a precious resource and should be used wisely to ensure a sustainable future.

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