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Water is one of Earth’s oldest substances. It has been on Earth for billions of years. Water contains hydrogen and oxygen. It is 2 parts hydrogen and 1 part oxygen. Another name for water is H2O. Water can exist as 3 states, a liquid (water), a solid (ice), or a gas (steam/water vapour). Water can change state from one to another according to the temperature. When water is placed under temperatures at or below 0 degrees, it will freeze and become a solid. When water turns to ice the water molecules will go from being loosely packed and able to move, to be tightly packed. However when ice is placed in temperatures above 0 degrees, it will melt and turn back into a liquid. When water boils, steam will rise. The water will slowly turn from a liquid into a gas. The molecules will then move freely and in any way they want. When steam touches a cold surface, it will create little water droplets known as condensation. It will then turn back into water. Water or H2O is a reversible substance and is useful to human beings. Each state serves a purpose in our world, whether it is to keep us hydrated or just to keep our drinks cool in the summer.
How does water change state?
