Water: Properties of water; melting and boiling points of water; electrical conductivity; structure of water; hydrogen bonding; sources of water; sources of fresh water in Bangladesh; water quality parameters (colour and taste; turbidity; presence of radioactive substances; presence of waste; dissolved oxygen; temperature; pH and salinity); recycling of water; role of water in conservation of nature; necessity of quality water; purification of water (filtration; chlorination; boiling and distillation); reasons for pollution of water sources in Bangladesh; effects of water pollution on plants, animals and human beings; effects of global warming on fresh water; strategy for preventing water pollution and responsibility of citizens or public awareness; prevention of water pollution by industries; prevention of water pollution due to soil erosion from agricultural land; conservation of water sources and development.

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