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.Continue Reading
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
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 >
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 >
The time it takes for salt water to freeze depends on the amount of salt in the water, the temperature of the water, and the volume of water. The more salt the water has, the lower its freezing point. Smaller volumes of water will freeze more quickly than larger volumes.Full Answer >
When salt is added to water, it raises the boiling point, requiring the salt water to reach a higher temperature to boil. The boiling point increases as more salt is added to the water.Full Answer >