9th science 1st lesson notes
Answers
Topic?? _____
Two number 9s, a number 9 large, a number 6 with extra dip, a number 7, two number 45s, one with cheese, and a large soda.
Answer:
Introduction
Everything in this universe is made of materials which scientist has names ‘matter’.
The matter is made up of very small tiny particles. It is not continuous but is particulate.
The matter is anything that occupies space and has mass.
Particles of matter have space between them and are continuously moving.
Particles of matter attract each other.
States of Matter: It has 3 states.
matter-surroundings-cbse-notes-class-9-science-1
Matter can change its state from solid to liquid and from liquid to gas and vice-versa.
matter-surroundings-cbse-notes-class-9-science-2
Effect of temperature: On increasing the heat, the particles gain energy and start vibrating with greater energy. Due to increased kinetic energy the particles overcome the force of attraction and a new state is obtained.
Melting point: The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.
Boiling point: The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. Boiling is a bulk phenomenon.
Explanation:
I hope it's helpful for you
Thanks me
Mark me as Branilist
vote me as Exelent