By the salinity or salt level in the water which can be measure by a number of devices most commonly the hydrometer or refractometer.
the amount of salt dissolved in the water
taste
Tap water is fresh water. The phrase "fresh water" refers to water with very little or no salt in it (as opposed to salt water, such as is found in oceans). Tap water contains little or no salt, and is therefore fresh water.
Fresh and salt water are very different for one key reason, fresh water doesn't contain salt and salt water obviously does. There are different flora and fauna in fresh and salt water for this reason.
Salt water has higher density than the body of a person who floats on it, but the person's body may sink in less dense fresh water.
on fresh salt water
Salt water is water that has salt in it and it is found in oceans. Fresh water does not have salt and is found in rivers and lakes.
there is salt in salt water and little salt in fresh water
salt water
Salt water is basically just fresh water with salt mixed in.
Salt water is basically just fresh water with salt mixed in.
There was salt water but they have replaced it with fresh water.