Science Buddies: "Ask an Expert"

Hello:

https://www.che.ufl.edu/unit-ops-lab/ex ... ration.pdf

Scroll down to find picture 2, in which the researchers say to use a 'film spacer' to separate the glass plates? What are they referring to?

Hello,
The Ask the Expert forums are for students in grades K-12 who are doing science projects. If you are doing a science project, please tell us more about your project, including your hypotheses and how you plan to conduct the experiments to test your hypotheses. If you are not doing a science project, there are other forums on the internet where your questions would be more appropriate. Thank you.