Names: Bryce Bickham, Garrett Grove, Jake Skinner
Materials needed:
-5 Pipettes
-2 Liter bottle
-5 Bolts (of equal size and mass)
-Water
-Scissors
-Tape
-Sharpie Marker
Safety Precautions:
-wear safety goggles
-wash hands immediately if ethanol is spilled upon them
-don't intake ethanol into body
Procedure:
1. Fill 2 Liter bottle with water
2.Using the sharpie marker write one on a pipette, two on another, up until each pipette has a different number to five on the chambers.
3. Slip a bolt onto each pipette (fig 1)
Fig 1
3. If a bolt is loose on a pipette use 1 inch of tape to secure it onto pipette
5. when a bolt is secured onto each pipette cut each pipette tube at a different lengths (proportional to fig 2)(except pipette number five)
6. place all five pipettes into the 2 liter bottle of water and tighten the lid.
7.Once the lid has been tightened squeeze the bottle until all five pipettes sink to the bottom of the bottle, in order from one to five, then lessen until all five come back up, in order from five to one.
Why it works
The density of a single pipette is less than 1 so the pipette floats naturally. But when more mass is added (the bolts) the density is more. But the pipette still floats. Why? It is because the air inside the pipette make the density less. Then to make it sink the bottle was squeezed. This worked because there was air in the pipette and some in the bottle. Gas can compress but the water can't so the air in the pipette as well as the air outside was compressed to allow water in. This changed the density of the pipettes to allow them to sink. when the pressing on the bottle weakened the pressure lessened so water (mass) left the pipette changing the density to once again less than that of water.
