We need water!

Now that we are in summer we need to drink lots of water. It is so hot around here that blogging I thought could be interesting to write little bit about water.....im drinking water all time!!!

Water (in its pure form) is a tasteless, odorless substance that is essential to all known forms of life and is known as the universal solvent. It appears colorless to the naked eye in small quantities, though it can be seen to be blue with scientific instruments or in large quantities (as in a swimming pool). An abundant substance on Earth (the UN Environment Program estimates there are 1400 million cubic kilometers), water exists in many forms. It appears mostly in the oceans (saltwater) and polar ice caps, but also as clouds, rain water, rivers, freshwater aquifers, lakes, and sea ice. Water in these bodies continuously moves through a cycle of evaporation, precipitation, and runoff to the sea. Clean water is essential to human health and in many parts of the world it is in short supply. Although mostly found on Earth, it can also be found on the moons Europa and Enceladus. Thales of Miletus, an early Greek philosopher, known for his analysis of the scope and nature of the term "landscaping," believed that "all is water."

Etimology

The word "water" comes from the Old English wæter. The word is derived from the Proto-Indo-European language root *wod-or with other forms including *ud- and *wed-; the source of the word wet. This root is the source for words about water in many European languages c.f German "Wasser", Latvian "ūdens", Swedish "Vatten" or Russian "вода" (voda).

Humans use water in typically three variety of ways.

For drinking - About 72% of the fat free mass of the human body is made of water. To function properly, the body requires between one and seven litres of water per day to avoid dehydration, the precise amount depends on the level of activity, temperature, humidity, and other factors. Most of this is ingested through foods or beverages other than drinking straight water (hot tea being often used in deserts to avoid dehydration, etc.). It is not clear how much water intake is needed by healthy people.

However, for those who do not have kidney problems, it is rather difficult to drink too much water, but (especially in warm humid weather and while exercising) dangerous to drink too little. People can drink far more water than necessary while exercising, however, putting them at risk of water intoxication, which can be fatal. The "fact" that a person should consume eight glasses of water per day cannot be traced back to a scientific source. There are other myths such as the effect of water on weight loss and constipation that have been dispelled.

The latest dietary reference intake report by the US National Research Council recommended (including food sources): 2.7 liters of water total for women and 3.7 liters for men. Water is lost from the body in urine and feces, through sweating, and by exhalation of water vapor in the breath. Humans require water that does not contain too many impurities. Common impurities include metal salts and/or harmful bacteria, such as vibrio. Some solutes are acceptable and even desirable for perceived taste enhancement and to provide needed electrolytes.

The other ways are as a solvent and as a thermal transferrer.
Click on the title, you will find much more info about water.