| Matter in our surroundings | Class 9 CBSE | One shot Revision |

​This video is a complete breakdown of the chapter Matter in Our Surroundings! We cover everything from the basic nature of matter to the factors affecting phase changes and cooling. Perfect for students looking for a comprehensive revision or an easy-to-understand explanation of these fundamental chemistry concepts.
​What You'll Learn:
​Matter: Definition, physical nature (particulate), and key characteristics of particles of matter (space between them, constant motion, attraction).
​States of Matter: Detailed comparison of Solid, Liquid, and Gas based on properties like shape, volume, rigidity, compressibility, inter-particle force, kinetic energy, density, and diffusion.
​Change of State: How temperature and pressure affect matter's state.
​Melting Point & Latent Heat of Fusion
​Boiling Point & Latent Heat of Vaporisation
​Sublimation (Solid \rightleftharpoons Gas)
​Interconversion of States (Melting, Freezing, Condensation, etc.)
​Evaporation & Cooling:
​Definition of Evaporation and the difference between it and boiling.
​Factors Affecting Evaporation (Surface Area, Temperature, Wind Speed, Humidity).
​How Evaporation Causes Cooling (The concept of latent heat absorption).
​Real-life Examples of Cooling by Evaporation (Acetone on palm, water in an earthen pot, sweating).
​Temperature Conversion Formula: Learn how to convert between Kelvin (K) and Celsius (T) using the formula: T(K) = T(°C) + 273.
​📚 Study Notes:
​Matter: Anything that occupies space (volume) and has mass.
​Latent Heat: The hidden heat energy required to change the state of 1 kg of a substance without any change in temperature.
​Sublimation Examples: Camphor, Naphthalene balls, Dry Ice (Solid \text{CO}_2).
​Liquefaction of Gases: Done by applying high pressure and reducing temperature.
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