Salt Water Aquarium III

Again, I was thinking back to the salt water aquarium and became mindful of one last fluid mechanic principle. I noticed that the aquarium had a hydrometer. A hydrometer is a tube that allows for the measurement of the salinity in the tank. The density of the salt water will change based on the salt content. This makes the hydrometer float freely at different depths. The depth the hydrometer floats freely is recorded and the salinity can be determined.