Basic principle of hydrogen economy is transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose ? Support your answer with the chemical equation if required.
Hydrogen is a gas at room temperature. Because of its bulk, it is difficult to transport it either by rail or by road. However, by cooling and applying high pressure, gaseous ${ H }{ 2 }$ can be converted into liquid
${ H }{ 2 }$ which has much smaller volume and hence, can be transporated easily.
Thus, the basic property of hydrogen which is useful for hydrogen economy is that it can be converted into a liquid - by cooling under high pressure.