NCERT Class 6 Science Chapter 8
A Journey through States of Water
This chapter takes Class 6 CBSE students through the three states of water — solid, liquid, and gas — and the transitions between them driven by changes in temperature. Students explore processes like evaporation, condensation, melting, and freezing, and understand the water cycle and its importance for life on Earth. The chapter connects physical science concepts to environmental awareness about water conservation.
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Key Terms
- Evaporation
- The process by which liquid water changes into water vapour (gas) at any temperature below boiling point.
- Condensation
- The process by which water vapour cools down and changes back into liquid water.
- Melting
- The change of state from solid (ice) to liquid (water) when heat is absorbed.
- Freezing
- The change of state from liquid (water) to solid (ice) when heat is removed.
- Water Cycle
- The continuous natural cycle through which water evaporates, forms clouds, precipitates as rain or snow, and returns to water bodies.
- Precipitation
- The process by which water falls from clouds to the Earth's surface in the form of rain, snow, sleet, or hail.
Frequently Asked Questions
What are the three states of water in Class 6 Science?▾
The three states of water are solid (ice), liquid (water), and gas (water vapour or steam). Water can change between these states depending on the temperature — it melts at 0°C and boils at 100°C.
What is the water cycle in Class 6 Science Chapter 8?▾
The water cycle is the continuous movement of water through the environment. Water evaporates from water bodies, forms clouds by condensation, falls as precipitation (rain/snow), and flows back to rivers and oceans.
What is the difference between evaporation and boiling in Class 6?▾
Evaporation occurs at the surface of a liquid at any temperature below boiling point, while boiling occurs throughout the liquid at a specific temperature (100°C for water). Evaporation is slower and occurs naturally.
What is condensation in Class 6 Science?▾
Condensation is the process by which water vapour cools and turns into liquid water. We see this when water droplets form on a cold glass or when dew appears on grass in the morning.
Why is the water cycle important in Class 6 Science?▾
The water cycle is vital for all life on Earth. It distributes fresh water across the globe through evaporation and precipitation, replenishes rivers, lakes, and groundwater, and regulates the Earth's climate and weather patterns.
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