Answer:
Water is classified as fresh or saltwater based on its salinity, which is the amount of dissolved salts and minerals in the water. The parameters by which water is classified as fresh or saltwater are:
1. Salinity level: Freshwater typically has a salinity level of less than 0.5 parts per thousand (ppt), whereas saltwater has a salinity level of 35 ppt or higher. Salinity levels in between these two ranges are considered brackish water.
2. Source: Freshwater comes from sources such as rivers, lakes, and groundwater, whereas saltwater comes from oceans and seas.
3. Location: Freshwater is typically found on land, whereas saltwater is found in oceans and seas.
4. Density: Saltwater is denser than freshwater, which means that objects float more easily in freshwater than in saltwater.
5. Chemical composition: Freshwater and saltwater have different chemical compositions, with saltwater containing higher levels of sodium, chloride, and other minerals.
Overall, the parameters by which water is classified as fresh or saltwater are based on its salinity level, source, location, density, and chemical composition. These parameters are important to consider for a variety of purposes, such as water management, conservation, and environmental protection.
Step-by-step explanation: