Wet cooling tower is a heat rejection device that extracts heat from the moving water stream to the atmosphere thereby reducing the water temperature significantly. Type of heat rejection in a cooling tower is termed "evaporative" in that it allows a small portion of the water being cooled to evaporate into a moving air stream to provide significant cooling to the rest of that water stream. Think about something hot being cooled down by pouring water onto it. A wet surface cools down much faster than a dry one. Similarly, evaporative heat rejection devices, such as cooling towers are much more effective than their dry counterparts. Common applications for cooling towers are providing cooled water for air-conditioning, manufacturing and electric power generation.