Build a Hydrometer

In class we did a lab that involved building a hydrometer. A hydrometer measures salinity which is the amount of dissolved salt in a body of water. If salt is added to a body of water the hydrometer will float higher because there is more salt within the body of water.The addition of salt adds density to the water therefore things float more. That is why it is easier to float in the ocean rather than a swimming pool because the ocean contains a higher salinity so it is more dense. Density is the amount of mass that a certain object has. Another factor that can effect the salinity of seawater is the temperature. This is because the water heats up and therefore becomes less dense. These are the things that I learned while conducting this lab.