Chapter 1, "Matter in Our Surroundings,"

 Based on Class 9 Science Chapter 1, "Matter in Our Surroundings," here are the statements extracted line by line:

Matter and Its Physical Nature

 * Matter is made up of particles.

 * The particles of matter are very small; they are small beyond our imagination.

Characteristics of Particles of Matter

 * Particles of matter have space between them.

 * When we make tea, coffee, or lemonade, particles of one type of matter get into spaces between particles of the other.

 * This shows that there is enough space between particles of matter.

 * Particles of matter are continuously moving; they possess what we call kinetic energy.

 * As the temperature rises, particles move faster.

 * Particles of matter attract each other.

States of Matter

 * Matter around us exists in three different states: Solid, Liquid, and Gas.

 * Solid particles are closely packed, while liquid particles are less closely packed, and gas particles are far apart.

 * Forces of attraction are very strong in solids, less strong in liquids, and negligible in gases.

 * Solids have a definite shape and volume.

 * Liquids have no definite shape but a definite volume.

 * Gases have neither a definite shape nor a definite volume.

 * Solids have high density and cannot be diffused.

 * Liquids have lower density than solids and can diffuse.

 * Gases have the least density and can easily diffuse.

Change of State

 * Water can exist in three states: Ice (solid), water (liquid), and water vapour (gas).

 * On increasing the temperature of solids, the kinetic energy of the particles increases.

 * Due to the increase in kinetic energy, particles start vibrating with greater speed.

 * Energy supplied by heat overcomes the forces of attraction between particles.

 * Particles leave their fixed positions and start moving more freely.

 * The minimum temperature at which a solid melts to become a liquid at atmospheric pressure is called its melting point.

 * The melting point of ice is 273.15K.

 * Latent heat is the heat energy absorbed by a substance during a change of state without showing a rise in temperature.

 * Latent heat of fusion is the amount of heat energy required to change 1kg of solid into liquid at atmospheric pressure at its melting point.

 * Boiling point is the temperature at which a liquid starts boiling at atmospheric pressure.

 * Applying pressure and reducing temperature can liquefy gases.

Evaporation

 * Evaporation is the phenomenon of change of a liquid into vapour at any temperature below its boiling point.

 * Evaporation is a surface phenomenon.

 * The rate of evaporation increases with an increase in surface area.

 * The rate of evaporation increases with an increase in temperature.

 * The rate of evaporation decreases with an increase in humidity.

 * The rate of evaporation increases with an increase in wind speed.

 * Evaporation causes cooling because particles of liquid absorb energy from the surroundings to regain energy lost during evaporation.

 * We wear cotton clothes in summer because cotton absorbs sweat and exposes it to the atmosphere for easy evaporation, which cools our body.