Water Cycle and Changes of State
Impurities will lower the freezing point and higher the boiling point.
Water
Comes from Water Bodies
Covers 2/3 of the Earth`s surface
Is the only thing which exists in all three states
Gaseous State
Water Vapour,Steam
Invisible
Solid State
Ice,Snow
Visible
Liquid State
Water Droplets
Visible
Water is heated up by the sun and rise to form water vapour.This process is called evaporation.Then,the water vapour condenses to form water droplets,.This process is called condensation.After that,they join together to form clouds.They then get heavy and fall as hail,rain,sleet or snow-depending on the temperature.This process is called precipitation.They then go back into the water bodies or soak into the ground .This process is called collection.Then ,the water cycle starts again.
Changing States of Water
Freezing
Lose heat and change from liquid to solid state.It takes place at 0 degrees Celcius
Melting
Gain heat and change from solid to liquid state and takes place at 0 degrees Celcius or higher.
Evaporation
Gaining heat and changing from liquid state to gaseous state and takes place at any temperature.
Factors
Temperature
The higher it is,the rate of evaporation
Area of exposed surface
The larger it is ,the higher the rate of evaporation
Humidity
The higher it is,the lower the rate of evaporation.
Wind
The stronger it is, the higher the rate of evaporation
Boling
Gain heat and changing form liquid state to gaseous state.Takes place at 100 degrees Celcius
Condensation
Lose heat and changing from gaseous state to liquid state
Takes place anytime
Steam
Is produced when water boils