Water Pollution: Quantity and Quality

Water Pollution means any physical (temperature, oxygen), chemical (mercury), or biological (disease, sewage) change to water that adversely effects its use by living things. This lecture briefly describe types of Water Pollution: Biological; Chemical and Physical. Water pollution is all about quantities: how much of a polluting substance is released and how big a volume of water it is released into. A small quantity of a toxic chemical may have little impact if it is spilled into the ocean from a ship.