The main difference between salt water and fresh water is the salinity content. Both contain salt or sodium chloride, but fresh water contains only small amounts of salt. The earth’s oceans and seas are saltwater ecosystems, while lakes, rivers, streams, marshes and ponds are freshwater ecosystems. Seawater’s viscosity, or internal resistance to flow, is higher than fresh water because of differences in salinity.Know More
The average salinity of ocean water is 3.5 percent which means that 35 grams of salt dissolve in a liter of seawater. The salinity of different bodies of water hinder organisms from thriving in both salt water and fresh water. Some plants and animals survive in one type of water but not the other.
Another considerable difference between the two is their density. Salt water has a higher density than fresh water because of the sodium chloride it contains. Furthermore, cold salt water is denser than warm salt water, but it becomes less dense when water freezes into ice. The boiling point of seawater is higher than that of pure water, and its freezing point is lower. The density of salt water is 1.025, while fresh water’s density is 1.0. Objects float more easily in salt water than in fresh water. Humans typically find it easy to float in seawater but not in fresh water.Learn more about Natural Resources
Salt water does not evaporate faster than fresh water; in fact, fresh water always evaporates faster than salt water. This is because of the difference between the salt and water molecules. Water is a slightly volatile substance, meaning that it is capable of evaporation, while salt is a nonvolatile substance, so it is not as capable of evaporation.Full Answer >
Sugar water freezes faster than salt water, because salt has more molecules than sugar. Normally, water freezes at 32°F, however, when a substance is added to the water, it lowers its freezing point. This is not because of the chemical nature of the substance being added, but rather the number of molecules. This is referred to as a colligative property.Full Answer >
Ice melts faster in fresh water than in salt water. The higher the salt content, the slower the ice melts.Full Answer >
Fresh water holds heat longer than salt water, because the addition of salt lowers the heat capacity of the solution relative to pure water. The lower heat capacity means that salt water both heats up and cools down more quickly than fresh water under the same conditions.Full Answer >