The Egyptians were the first people to record methods for treating water dating back more than 1,500 years to 400 A.D. Records indicate that the most common ways of cleaning water were by boiling it over a fire, heating it in the sun, or by dipping a heated piece of iron into it. Filtering boiling water through sand and gravel and then allowing it to cool was another common treatment method.
About 70% of the earth’s surface is covered with water.
Ninety-seven percent of the water on the earth is salt water. Salt water is filled with salt and other minerals but is undrinkable by humans. Although the salt can be removed, it is a difficult and expensive process.
Two percent of the water on earth is glacier ice at the North and South Poles. This ice is fresh water and could be melted but is too far away from where people live to be usable.
Less than 1% of all the water on earth is fresh, consumable and of use. We use this small amount of water for drinking, transportation, heating and cooling, industry, and many other purposes.
Everything is made of atoms. An atom is the smallest particle of an element, like oxygen or hydrogen. Atoms join to form molecules. A water molecule has three atoms: two hydrogen (H) atoms and one oxygen (O) atom. That’s why water is sometimes referred to as H2O. A single drop of water contains billions of water molecules.
Pure water is tasteless, odorless, and colorless. Water can occur in three states: solid (ice), liquid, or gas (vapor).
Solid water: Water freezes at 0° Celsius, 32° Fahrenheit. When water freezes, its molecules move further apart, making ice less dense than water. This means that ice will be lighter than the same volume of water, which is why ice will float in water.
Liquid water is wet and fluid. We use liquid water in many ways, including washing and drinking.
Water as a gas: Water vapor is always present in the air around us. You cannot see it. When you boil water, the water changes from a liquid to a gas (or water vapor). As some of the water vapor cools, we see it as a small cloud called steam. This cloud of steam is a mini version of the clouds we see in the sky. At sea level, steam is formed at 100° Celsius, 212° Fahrenheit.
The water vapor attaches to small bits of dust in the air. It forms raindrops at warm temperatures. In cold temperatures, it freezes and forms snow or hail.
The water cycle or hydrologic is a continuous cycle where water evaporates, travels into the air, and becomes part of a cloud, falls down to earth as precipitation, and then evaporates again. This repeats again and again in a never-ending cycle. Water keeps moving and changing from a solid to a liquid to a gas, over and over again.
Precipitation creates runoff that travels over the ground surface and helps to fill lakes and rivers. It also percolates or moves downward through openings in the soil to replenish aquifers under the ground. Some places receive more precipitation than others. These areas are usually close to oceans or large bodies of water that allow more water to evaporate and form clouds. The areas that receive less precipitation are often far from water or near mountains. As clouds move up and over mountains, the water vapor condenses to form precipitation and freezes. Snow falls on the peaks.
Water treatment is the process of cleaning water. Treatment makes the water safe for people to drink. Because water is a good solvent, it picks up all sorts of natural pollutants. In nature, water is not always clean enough for people to drink.
When the microscope was invented in the 1850s, germs could be seen in water for the first time. In 1902, Belgium was the first country to use chlorine to clean or treat water in a public water supply. Today, almost every city in the world treats its drinking water. Treatment includes disinfection with chlorine or other chemicals to kill any germs in the water.
A water meter measures the amount of water coming into your home or business. Your water meter may be in your basement or outside in a pit or hole. A meter reader reads the water meter on a regular basis. The utility company bills you for the water you use. The bill covers the costs of treating and distributing the water. Sometimes, a utility must buy water. All these costs and the wages for the utility’s staff must be met.
Water is a bargain. The average price of water in the United States is about $1.50 for 1,000 gallons. At that price, a gallon of water costs less than one penny. How does that compare with one can of soft drink?