Why is salt water denser than unsalted water?

Answer 1

Because the salt adds mass to the mixture without significantly increasing it's volume.

A greater mass with a similar volume means a greater density.

Answer 2

Simple :
a) Salt water = Salt + Water = S + W
b) Unsalted Water = Water = W

If S = 100 grams and W = 200 grams, (a) gives 300 grams and (b) gives only 200 grams. That's about mass.
This is related to density as density is directly proportional to mass. And also that S in S+W is mixed up well so S+W is thicker than just W (Like Water + Wheat powder is denser than just Water).

Answer 3

You answered that question when you stated Salt water VS unsalted water. Density is measured by the weight per 1 cubic ft of WATER. So if you add anything-like SALT that of course will be heavier or more DENSE.

Do a test. Take two vessels of water. Add salt to one of them. Drop a fresh or frozen pea in the two solutions. The more dense vessel will support the pea while the less dense solution the pea will sink. It make take a few experiments to get the exact amount of salt to make that work. (13% is a good start)

Answer 4

Because there is more mass per area.

Answer 5

cuz it contains salt duh