• Water is one of the basic necessites for all living organisms.
• Pure water is a liquid that has no taste, colour or smell.
• Water is unique because it can exist as a solid, liquid or gas.
• Freezing point of water-When water in liquid from is cooled to a certain temperature, it turns into ice which is in solid form/
• The freezing point of water is the temperature at which water turns into ice under normal atmospheric pressure.
• The freezing point of pure water is 0celcius.
• The freezing point of water can be explained using the kinetic theory of meeter.
• Metter which is made up of discrete particles exists in three states.
• The arrangement and movement of particles are different in ice water and water vapour.
• In the liquid state, the particles are not arranged closely to one another. There are spaces between the particles and the particles can move freely.
• When water is cooled, it loses heat to the environment. As the particles lose energy. Their movement becomes slower.
• As the particles keep losing energy, they arrange themselves closely to one another.At this point, the water has reached the freezing point
• The temperature remains at 0 celcius until all the water changes into ice.
• When water freezes completely, the temperature starts to decrease.
• Boiling point of water- the temperature at which pure water boil