How much water is there on Earth?
Water is a vital element made up of two elements hydrogen and Oxygen as H2O
(one oxygen and two hydrogen atoms). On our earth around 70.78 percent
of it is covered by water. Which is equivalent to
326,000,000,000,000,000,000 gallons (326 million trillion gallons.
Ninety-eight percent of the water on the planet is in the oceans, but
containing salt in it which makes in not safe to drink. Now out of 2% of
fresh water, 1.6 percent is locked up in the polar ice caps and
glaciers. The rest of water is present in the rivers,wells, float in the
air as clouds and water vapor, or is locked up in plants and animals. 6
countries (Brazil, Russia, Canada, Indonesia, China and Colombia) have
50 percent of the world's freshwater reserves.
- Water on Earth moves continually through the hydrological cycle of evaporation and transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea. Evaporation and transpiration contribute to the precipitation over land.
- The boiling point of water (and all other liquids) is dependent on the barometric pressure. For example, on the top of Mt. Everest water boils at 68 °C (154 °F), compared to 100 °C (212 °F) at sea level.
- The maximum density of water occurs at 3.98 °C (39.16 °F).
- Its density is 1,000 kg/m3
- At 4181.3 J/(kg·K), water has a high specific heat capacity, as well as a high heat of vaporization (40.65 kJ·mol−1)
- The collective mass of water found on, under, and over the surface of a planet is called the hydrosphere.
- Our body is 65 percent water, so if we weigh 100 kg, 65 kg of we are water
