CBSE Class 9 Science – Matter in Our Surroundings

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Study Materials

9th

9th - Science

Matter in Our Surroundings

Chapter Overview

Matter exists in different states: solid, liquid, and gas. The behavior of matter depends on temperature and pressure. This chapter discusses the physical properties of matter, phase changes, and real-life applications of these concepts.

Important Keywords

  • Matter: Anything that has mass and occupies space.
  • Solid: A state of matter with fixed shape and volume.
  • Liquid: A state of matter with a fixed volume but no fixed shape.
  • Gas: A state of matter with neither fixed shape nor fixed volume.
  • Evaporation: The process of a liquid turning into vapor.
  • Condensation: The process of gas turning into a liquid.
  • Sublimation: The process of a solid changing directly into a gas.

Detailed Notes

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