Tiêu đề Class 6 Science (Curiosity) Chapter 8- A Journey through States of Water Book Solution with notes.pdf ✅

Class VI Science (Curiosity) Book Solution with Key Notes/Points ©kvsecontent.com Chapter 8- A Journey through States of Water Key Notes Water ▪ A clear, colourless liquid that covers about 71% of the Earth's surface. ▪ Water molecules are made of two hydrogen atoms and one oxygen atom (H2O). ▪ It's found in oceans, rivers, lakes, and underground, and is crucial for all living organisms to survive. ▪ Water can dissolve many substances, which makes it important for chemical reactions in living things. States of Water ▪ Water exists in three states: solid (ice), liquid (water), and gas (water vapour) ▪ These states have different properties but are the same substance ▪ Water can change from one state to another through heating or cooling Evaporation ▪ The process of conversion of water into its vapour state ▪ Occurs continuously, even at room temperature ▪ Factors affecting evaporation rate: i. Surface area exposed to air (larger area = faster evaporation) ii. Temperature (higher temperature = faster evaporation) iii. Air movement (more wind = faster evaporation) iv. Humidity (higher humidity = slower evaporation) Condensation ▪ The process of conversion of water vapour into liquid state ▪ Occurs when water vapour comes in contact with a cold surface ▪ Examples include dew formation and water droplets on cold surfaces ▪ Plays a crucial role in cloud formation and rain Water Cycle ▪ Continuous circulation of water between Earth's surface and atmosphere ▪ Includes processes of evaporation, condensation, and precipitation ▪ Important for maintaining Earth's water balance ▪ Involves various water bodies like oceans, lakes, rivers, and groundwater
Class VI Science (Curiosity) Book Solution with Key Notes/Points ©kvsecontent.com Difference between steam and water vapour ▪ Water vapour is actually invisible but the presence of tiny droplets of water in the steam makes it visible. ▪ Steam is actually condensed water droplets we can see, while true water vapour is invisible. Key Terms and Definitions 1. Evaporation: The process of conversion of water into its vapour state 2. Condensation: The process of conversion of water vapour into its liquid state 3. Freezing: The process of conversion of liquid into solid state 4. Melting: The process of conversion of solid into liquid state 5. Humidity: The amount of water vapour present in the air 6. Water cycle: The continuous circulation of water between the Earth's surface and atmosphere 7. Water vapour: The gaseous state of water, invisible in the air 8. Cooling effect: The sensation of coolness caused by evaporation of water 9. Solid state: The state of matter with fixed shape and volume (like ice) 10. Liquid state: The state of matter that flows and takes the shape of its container 11. Gaseous state: The state of matter that spreads to fill its container completely 12. Steam: Water vapour that is visible due to tiny water droplets suspended in it (different from invisible water vapour) 13. Groundwater: Water stored beneath the Earth's surface 14. Precipitation: Water falling from clouds in the form of rain, snow, or hail 15. Experiment: A scientific procedure to test or establish a fact 16. Investigate: To carry out a systematic examination 17. Record: To document observations and findings 18. Predict: To state what one thinks will happen Important Concept Cooling Effect and Applications ▪ Water's evaporation causes a cooling effect, which explains several everyday phenomena o Why earthen pots (matkas) keep water cool o How sweat helps cool our body o Why sprinkling water on floors provides cooling in summer o Why hand sanitizer feels cool when rubbed on hands Role of Dust Particles ▪ Dust particles play a crucial role in cloud formation. ▪ Water vapour condenses around dust particles in the atmosphere to form water droplets, which eventually become clouds.