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Getting the evidence

Two instruments used to analyze ocean water are hydrometersAn instrument that determines the specific gravity of a liquid., which measure seawater density, and Nansen bottles. Nansen bottles are more sophisticated versions of those collection bottles used on the H.M.S. Challenger. The bottles are self-closing containers with thermometers; they can draw in water at different depths. Through their use, scientists

have learned that the sea has different layers of water with specific salinity levels and temperatures.

In the two experiments that follow, you will learn more about salinity by measuring it in different ways.

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1. Introduction
2. Get out the yardstick
3. Where did the salt come from?
4. Getting the evidence
5. Experiment 1 - Making a Hydrometer: How can salinity be measured?
6. Experiment 2 - Density Ball: How to make a standard for measuring density
7. Design Your Own Experiment