Water is a molecule made of one oxygen atom and two hydrogen atoms. When most people say "water" they are referring to its liquid state, but the name also describes ice and steam. These states serve as the base of the Celsius temperature system: water freezes at 0 degrees and boils at 100 degrees.
Water is a powerful solvent. By itself, water doesn't conduct electricity, but the minerals dissolved in water do. This can be seen in tea scum. The scum created by calcium and bicarbonate molecules that have been boiled out of the water joining at the surface, forming calcium bicarbonate. Ocean water is 3.5% salt.
Precipitation is created by the water cycle. The sun evaporates ocean water, forming clouds. These clouds rain on land, and this water runs into streams and rivers which flow back into the ocean.
In the pipe experiment, only the water evaporates, leaving behind the dye. When sea water evaporates, it leaves behind the salt, which is why rainwater is fresh.
There are 326,000,000,000,000,000,000 gallons of water on earth. 97% of that water is in the oceans, and this water covers 71% of the planet's surface; 2.4% in the polar ice caps; .36% in aquifers; and 36% in lakes, rivers, and streams. Only 2%-3% of the earth's water is fresh.
Posted 4510 day ago