We built a hydrometer using zinc balls. We put the balls in a dropper. We continued to add zing balls until the plastic dropper stood straight up in the water without touching the bottom. Once it was balanced we continued the process of adding zinc. If it started to not float we added salt which balanced out its salinity.
1. salinity: relating to salts
2. It will float highwe
3. H20
4. In the ocean
5. Density
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