Purpose: To show the change in density of water due to (a) a change in its salinity, and (b) a change in its temperature.

1. Place a density ball in 60 grams/liter salt solution and watch it float; then place it in fresh water and watch it sink.
2. Place a density ball in water at approximately 45^oC. The ball sinks (specific gravity of water 0.990). Again, place the ball in water at a temperature of 15^oC and watch it float (specific gravity of water 0.999).

See H09: Galileo's Thermometer for another similar demonstraton.

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