An experiment is set up to demonstrate osmosis using a simple osmometer. A bag made of selectively permeable visking tubing is filled with a concentrated sucrose solution, tied securely, and connected to a vertical capillary tube. The visking tubing is then immersed in a beaker of pure water.

The level of the solution inside the capillary tube is measured using a ruler:

• The initial level is recorded as $14.5mm$.
• The final level is recorded as $39.5mm$.
• The ruler used to measure the distance is accurate to the nearest $0.5mm$ (giving an uncertainty of $\pm 0.5mm$ for each individual reading).