Affect of An Eggs Circumference

Due to Osmosis of Different Liquids?


Does the circumference of an egg change, if it is put in different liquids?


Osmosis is the diffusion of water through a selectively permeable membrane. In Osmosis, as in other forms of diffusion, molecules move from an area of high concentration to an area of low concentration. The inside of a cell's lipid bilayer is hydrophobic, or "water-hating." Because of this, water molecules have a hard time passing through the cell membrane. Many cells contain water channel proteins, known as aquaporins, that allows water to pass right through them.

Water tends to move across the membrane until equilibrium is reached. Then the concentrations of water and sugar will be the same on both sides of the membrane. The two solutions will become isotonic. Hypertonic is when one side has more strength than the other. Hypotonic is when the one side has low strength.

The net movement of water out of or into a cell produces a force known as Osmotic Pressure. When in a cell Osmotic Pressure can cause a cell in hypertonic solutions to shrink, and one in hypotonic to swell. Cells contain salts, sugars, proteins, and other dissolved molecules, they are almost always hypertonic to fresh water. In plant cells, Osmotic Pressure can cause changes in the size of the central vacuole, which shrinks or swells as water moves into or out of the cell.


If the egg is placed in vinegar, then the circumference will increase.


  • Egg
  • Beaker
  • Water
  • Vinegar
  • Food Coloring
  • Salt
  • Soap
  • Ruler
  • String
  • Sharpy
  • Paper (to record data)


  1. Observe eggs features, measure circumference, and right down observation and measurement on paper.
  2. Get materials listed above.
  3. Get beaker. Place egg inside of beaker, then submerge egg with vinegar.
  4. Soak egg for two days.
  5. Blot dry.
  6. Repeat step 1.
  7. Soak egg in water for two days.
  8. Blot dry.
  9. Repeat step 1.
  10. Soak egg in Food Coloring.
  11. Blot dry.
  12. Repeat step 1.
  13. Soak egg in oil for two days.
  14. Blot dry.
  15. Repeat step 1.
  16. Begin your paper!

Data and Observations:



My hypothesis is correct ! The circumference of the egg without any substances was 14 cm. The egg expanded when put in Vinegar by 2.5 cm .When placed in water it's circumference didn't change. The eggs circumference decreased about 2 cm. when in food coloring and salt water. The egg had the smallest circumference in oil. The inside of a cell's lipid bilayer is hydrophobic, or "water-hating." Because of this, water molecules had a hard time passing through the cell membrane. Error could have occurred if it hadn't been measured in centimeters or if it hadn't followed the procedures step by step.

By: TaShaun Edwards