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
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 >
Ice melts faster in fresh water than in salt water. The higher the salt content, the slower the ice melts.Full Answer >
Freezing is one way to desalinate salt water. When salt water freezes, the salt is left out of the ice crystals as they form. Once frozen, the salt remains on the outside of the ice and can be brushed away before melting.Full Answer >
Adding salt to water actually boosts the boiling point a few degrees, but even with the higher boiling point, salt water boils faster than pure water because salt water has a lower heat capacity than pure water. This means that it does not take as much energy to boost the temperature of salt water as it does to heat up pure water.Full Answer >