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# How does the salinity of water affect the buoyancy of objects placed into it

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by mahir ben said on 25 June 2010

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#### Transcript of How does the salinity of water affect the buoyancy of objects placed into it

How does the salinity of water affect the buoyancy of object placed into it?
Introduction When we thought of this experiment, we thought we would be venturing into deep waters. However, once we went beneath the surface, we discovered it was a totally different kettle of fish. Far from being out of our depth, we took to the experiment like a duck to water. Aim To determine the relationship between salinity and floatability/buoyanacy. An increase in salinity will lead to an increase in floatability due to the increase in water denisty. Hypothesis Apparatus Hooked set of weights(100g)
Newton meter(±0.05N)
Clampstand
Tap Water( for practicality)
Salt(NaCl)
Stirrer
Fish tank(Friskies)
Weighing scale(±1g)
Weighing boat Variables Controlled Temperature
Volume of water
Mass of weights
Level of submersion Independent Salt content Dependent Concentration(Salt)
Floatabililty
Density Method: Stage 1: Set up as shown... Stage 2: Measure out 1,50L of water using the measuring cylinder Stage 3: Pour the water into the fish tank. Stage 4: Take a reading from the Newtonmeter(whilst the weights are out of the water) Stage 5: Lower the clamp so that the weights have submerged (up to the same point every trial). Take another reading from the newtonmeter. Make sure there is no contact between the weights and the container. Let the readings settle/stabilize before taking the reading. Stage 6: Raise the clamp so that the weight is out of the fish tank but still over the water to prevent water loss. Stage 7: Measure out 58.00g of salt into a weighing boat using the weighing scales. Stage 8: Pour salt into the water. Stage 9: Stir thoroughly until salt is no longer visible. Stage 10: Repeat step 5 to 10 eight more times. Each time increasing the amount of salt in the water by 58.00g. Results CONCLUSION 3,529,412 puppies Thank you (Applause) 1,500,000,000g !!
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