Tag: Water Grade 4

Common Waterborne Diseases: Prevention and Treatment

The most commonly talked about water borne diseases are listed and briefly described below: Cholera This disease is caused by a bacteria in contaminated drinking water, rivers and coastal waters. Symptoms are watery diarrhoea, vomiting and leg cramps and can appear as soon as two hours after exposure to bacteria to as late as 5…...

Methods of Water Purification

There are many different methods of water purification. The ones important for your stage are listed and discussed here below. Boiling Water This is probably the simplest method of water purification. It is necessary to bring the water to a full or rolling boil for at least three to five minutes or longer, NOT WHEN…...

Water Pollution: Their Sources and Minimising their Effects

What is water pollution? This phenomenon occurs when toxic substances enter water bodies (eg. river), dissolve in them or lay suspended in the water. This degrades the quality of the water. This is a problem because the aquatic habitats can be destroyed, the pollutants can sleep through the ground water and end up in our…...

Chemical Properties of Water

Be sure to check out all the posts on the Physical Properties of water!! Recall that the properties of water can be divided into two categories: chemical and physical. This post focuses on the chemical properties of water. Conductivity Regular water and electricity NEVER go together. I am sure that you have always been told…...

Physical Properties of Water: Part 3

This post is a continuation from “Physical Properties of Water: Part 2” Temperature:¬†Temperature exerts a major influence on biological activity and growth. Temperature governs the kinds of organisms that can live in rivers and lakes because aquatic species all have a preferred temperature range. As temperatures get too far above or below this preferred range,…...

Physical Properties of Water: Part 2

This post is a continuation from “Physical Properties of Water: Part 1” Water Density: Density can be described as how close together the molecules of a substance are or how much mass the same substance has in a given space. Take for example a cup of jelly beans and a cup of marshmallows. The cup…...

Physical Properties of Water: Part 1

Water has many different properties and can be divided into two broad categories: physical and chemical properties. Physical Properties Adhesion and Cohesion: In the simplest of terms, water adhesion refers to the attraction of water molecules to other substances and cohesion refers to the attraction of water molecules to themselves. You can think of it…...