As downslope motion of air results in decease in humidity, thus the opposite sides of barriers usually experience relatively light ppt. Since lifting of air masses is the cause of almost all ppt, amount and frequency of rain is genrally greater on windward side of the mountain. Therefore, ppt tends to be heavier near coastlines. Main source of moisture for ppt is evaporation from oceans. Heavy precipitation occurs near the equator and decreases with the increase in the latitude i.e. The hydrological aspect of precipitation studies are conceived with the forces in which precipitation occur, its variation in both, space and time. Hydrologists are only interested in the distribution itself, in how much precipitation occurs and when and where it falls and their interest cease when precipitation reaches ground. But this small amount serves as a continuous source of supply. Precipitation reactions can help determine the presence of various ions. Atmospheric water accounts for less than 0.001% of world total supply of land, ocean and atmospheric water. This insoluble salt that falls out of solution and filtered is known as the precipitate. This can halt dislocation movements within the structure of its crystal lattice. This technique gives strength to alloys by hardening them and adding fine, solid impurities known as precipitates.
Total amount of water in atmosphere represent only a minute proportion of world water budget. Precipitation hardening is a method that makes use of heat application to a pliable material, like metal alloy, to make it tougher. The study of precipitation is thus of fundamental importance to hydrolysis but detail investigation of the mechanism of its formation is the domain of meteorologists and climatologists. In some countries precipitation data may constitute the only hydrological record. When the reaction occurs, the solid formed is called the precipitate. Data of rainfall (precipitation) is more readily available, for cities and longer period, than for any other component of hydrological cycle. Precipitation is the formation of a solid in a solution during a chemical reaction. Knowledge of rainfall in space and time is necessary for understanding soil moisture, groundwater, recharge and river flow.