10 interesting Facts about Water

1.  Almost 97% of water in the earth is sour (salty) or undrinkable. Another 2% is locked in glaciers. Only 1% is fresh.
2. The United States uses about 346,000 million gallons of fresh water every day.
3. The average cost for water supplied to a home in the U.S. is about $2.00 for 1,000 gallons, which equals about 5 gallons for a penny.
4. Water expands by 9% when it freezes. Frozen water (ice) is lighter than water, which is why ice floats in water. 
5. Cold water is lighter than hot water. Source . 
6. By the time a person feels thirsty, his or her body has lost over 1 percent of its total water amount. Source  
7. Drinking too much water too quickly can lead to water intoxication. Water intoxication occurs when water dilutes the sodium level in the bloodstream and causes an imbalance of water in the brain.Water intoxication is most likely to occur during periods of intense athletic performance.
8. Pure water has no smell and no taste, it also has a pH level around 7. 
9. Water is the second most common molecule in the universe. The most common is hydrogen gas, H2. Souce
10.  The biggest known cloud of water vapour was discovered by Nasa scientists around a black hole 12 billion light years from Earth. There is 140 trillion times as much water in it as all the water in the world’s oceans.