The70% of the Earth is covered with water. However, only 3% is fresh water, and most of that fresh water (2%) is frozen.
In a period of100 years, a water molecule spends 98 years in the ocean, 20 months in the form of ice, 2 weeks in lakes and rivers, and less than a week in theatmosphere.
Raindrops have no teardrop shape. Using high-speed cameras, scientists have found that they are rather squashed in shape,spheroid.
Water is the55% of the weight of an adult human. And we need to ingest around two liters of water a day.
A person can survive a month without food, but only seven days at most without drinking water.
Most of the water we consume daily comes from food.95% of a tomato is water.Apples (85%), spinach (91%) or potatoes (80%) also have a high water content.
Just a few weeks ago, engineers at the University of Florida created a sflat surface that does not get wetRather, the drops of water roll on it. To achieve this, what they did was reproduce in plastic the shape and patterns of tiny hairs that grow on the bodies of spiders, which are designed to always remain dry.
It takes 450 liters of water to produce a chicken egg, 7,000 liters to refine a barrel of crude oil, and 148,000 liters to make a car.
At the University of Tokyo they have developed a material calledelastic waterfrom a mixture of two grams of clay, organic matter and natural water. It is ideal for making medicines and for repairing tissues.
Theaquagenic urticariait is a very rare form of allergic reaction to water. There are barely thirty cases in the medical literature and it is believed that it is due to the presence on the skin of a water-soluble antigen – a substance that activates the immune system -. In contact with water, the antigen dissolves, passes through the skin and causes the defense cells to release histamine. This causes the appearance of hives, itching and other allergic symptoms.
