Build a hydrometer

1. Define the term salinity.

 The amount of salt in water.

2. If you add salt to a water solution, will a hydrometer float higher or lower in the water? Explain your choice.

 Higher because salt takes more space to push up.

3. What effect does the addition of salt have on the properties of water?

 Makes it thicker.

4. Is it easier to float in the ocean than in a swimming pool? Explain why or why not.

 In ocean, more salinity. 

5. Define the term density.

 How much mass is in a certain space

 6. The salinity of seawater is also affected by the temperature of a body of water. Explain how temperature causes differences in the salinity of water.

Yes, because salt dissolves better in warm, warm is more dense.