How can you determine the relative densities of liquids?

Question

How can you determine the relative densities of liquids?

Answer 1

The brute-force approach would be to measure the weight per unit volume of each liquid. Assuming you did this carefully you could compute density of each and then compute relative density.

There is a device called a hygrometer that measures specific gravity - that is, relative density to water.  Again, each liquid could be measured and then compared to figure relative density.  

The most accurate way I think would be to take an object, weigh it in dry air, then weigh it suspended in each liquid. The ratio of the differences between dry-air weight and immersed weight (that is, displaced liquid weight) is relative density.

Answer 2

Try this fill a balloon with one of the fluids. place it in a container of the other fluid and weigh it in place. empty the balloon and measure the quantity of the fluid in the balloon.

Answer 3

Well, with the density of the liquid you want to know, divide it into the density of water and you will get it's relative density. Now, if you don't know the density of the liquid you have to use a densometer. This is just a bottle whose weight you know and you throw it into the liquid, then you just have to divide it's mass into the volume of the bottle that is under the liquid level and you will get the liquid's density.

Hope this helps.