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Matter In Our Surroundings Class 9 Science Ch-1 -Deep-talks blog

Class9 Science  

Matter in our surroundings

The things you should remember

Hello friends, today I am going to show you the things you should remember after study of this lesson.

  • characteristics of particles of matter~
  1. Particles of matter have space between them
  2. Particles of matter are continuously moving
  3. Particles of matter attract each other
  • States of matter~
  1. The solid state-the matter who can hold their shape is called solid. A solid forms from liquid or gas because the energy of the atom decreases when the atom takes up a relatively ordered three-dimensional structure.
  2. The liquid state-a liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a constant volume independent of pressure. This is the only state which has a definite volume but no fixed volume.
  3. The gaseous state- Gases are composed of molecules in constant random motion. A gas has fixed shape and will take on the shape of the space available.
  • Full form of-
  LPG-liquefied Petroleum gas
  CNG-compressed natural gas
  • Why matter change its state-
Matter changes state when energy is added or taken away. Most matter changes state because of changes in temperature and pressure. When matter is heated enough, the molecules move faster and with greater energy. If enough heat is added, a solid can become liquid and the liquid can become gas.
  • Melting point-
The temperature at which a substance will melt.
  • Latent heat-
The heat required to convert a solid into a liquid or vapour, a liquid into a vapour, without change of temperature
  • Boiling point-
The temperature at which a substance will boil
  • What is dry ice?
Dry ice is made from carbon dioxide gas. The carbon dioxide gas is pressurized and cooled to form liquid carbon dioxide. The liquid carbon dioxide is injected into either a block press or pelletizer
  • Evaporation-
Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature or pressure
  • What affects evaporation?
  1. Surface area
  2. Temperature
  3. Wind speed
  4. Humidity
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