Class 9 Science — Chapter 1: MATTER IN OUR SURROUNDINGS

What you'll learn

• ▸Particulate Nature of Matter
• ▸Characteristics of Particles: Size
• ▸Characteristics of Particles: Interparticle Space
• ▸Characteristics of Particles: Continuous Motion & Diffusion
• ▸Characteristics of Particles: Forces of Attraction
• ▸Properties of the Solid State
• ▸Properties of the Liquid State

Chapter Summary

--- PAGE 1 --- Chapter 1 MATTER IN OUR SURROUNDINGS As we look at our surroundings, we see a large variety of things with different shapes, sizes and textures. Everything in this universe is made up of material which scientists have named “matter”. The air we breathe, the food we eat, stones, clouds, stars, plants and animals, even a small drop of water or a particle of sand — every thing is matter. We can also see as we look around that all the things mentioned above occupy space and have mass. In other words, they have both mass* and volume**. Since early times, human beings have been trying to understand their surroundings. Early Indian philosophers classified matter in the form of five basic elements — the "Panch Tatva" — air, earth, fire, sky and water. According to them everything, living or non- living, was made up of these five basic elements. Ancient Greek philosophers had arrived at a similar classification of matter. Modern day scientists have evolved two types of classif…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Explain particle motion. Get Solution →
2. Describe spaces between particles. Get Solution →
3. Compare hot and cold diffusion. Get Solution →
4. According to the text, what are the two essential properties of matter? Get Solution →
5. What is the SI unit of mass as mentioned in the chapter? Get Solution →
6. Early Indian philosophers classified matter into five basic elements known as what? Get Solution →
7. The intermixing of particles of two different types of matter on their own is called what? Get Solution →
8. Which state of matter has a definite shape and a fixed volume? Get Solution →

Did you know?

• 💡 The scent of baking cookies spreads through a room as tiny particles diffuse.
• 💡 Even in a solid rock, its particles are constantly vibrating in fixed positions.
• 💡 If all the empty space in atoms disappeared, all humans could fit in an apple.
• 💡 A single drop of water contains more molecules than all the grains of sand on Earth.
• 💡 Water forms droplets and doesn't easily break because its particles strongly attract each other.

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