Water is a liquid.
Water . Water strictly refers to the liquid state of that substance , that prevails at standard ambient temperature and pressure ; but it often refers also to its solid state ( ice ) or its gaseous state ( steam or water vapor ) . Evaporation and transpiration contribute to the precipitation over land . A report , issued in November 2009 , suggests that by 2030 , in some developing regions of the world , water demand will exceed supply by 50 % . Large quantities of water , ice , and steam are used for cooling and heating , in industry and homes .