Lay a towel on the counter to catch excess water during the experiment. The water level should be as high as possible. Water will form a slight curved surface above the container due to surface tension. This slight dome will help keeping the monolayer within the thread loop. 2. Fill the glass plate or dish with purified water until level is slightly overfilled. Fill the glass plate or dish with purified water until level is slightly overfilled. 3. Cut a piece of thread approximately 25 cm long. Cut a piece of thread approximately 25 cm long. Cut a piece of thread approximately 25 cm long. Cut a piece of thread approximately 25 cm long. 4. Create a loop by tying the two ends together using a double knot. Create a loop by tying the two ends together using double knot. 5. Cut any excess thread from the knots. Trim the ends as close to the knot as possible. Cut any excess thread from the knots. Trim ends as close to knot possible. 6. Measure and record the length of the loop of thread. It is easiest to pull the loop tight and measure this length, then multiply this length by