It is the simplest compound of oxygen and hydrogen being comprised of two molecules of hydrogen to one of oxygen. It is formed when an electric spark passes through a mixture of gases and is the product of the combustion of al hydrogen–containing compounds like: petrol, coal, gas and wood.
Water is essential to life. It is the medium which carries food to plants and animals. Pure water freezes at 0 degrees Celsius and boils at 100 degrees Celsius at sea level. This s a recognised standard of temperature on this scale. It has maximum density at four degrees Celsius.
Heating water above 100 C converts it to steam. This has been useful to drive all manner of engines – everything from railway engines to power stations.
Water is one of the few things which freezes from the surface down rather from the centre up. This has an important significance for life in rivers and lakes.
Water is essential to life. It is the medium which carries food to plants and animals. Pure water freezes at 0 degrees Celsius and boils at 100 degrees Celsius at sea level. This s a recognised standard of temperature on this scale. It has maximum density at four degrees Celsius.
Heating water above 100 C converts it to steam. This has been useful to drive all manner of engines – everything from railway engines to power stations.
Water is one of the few things which freezes from the surface down rather from the centre up. This has an important significance for life in rivers and lakes.