Need help designing a Diffusion experiment

[imrealdumb]

Homework Statement

Doing a science project for school. I have a fish tank and a divider separating one colored liquid on one side and another colored liquid on the other. I need it air tight initially, but will later remove the divider to allow the liquids to mix, demonstrating diffusion.

Homework Equations

None

The Attempt at a Solution

I have a tank and an acrylic divider. The issue is how to make it air tight initially while allowing the opportunity to remove the divider and allowing the liquids to mix.

Any ideas? Thanks, and sorry if this is too juvenile of a question.

 

[imrealdumb]

Anyone?

I recognize this may be a rudimentary post, but I'm hoping some people here might have some suggestions.

Thanks.

 

[andrevdh]

Have a look at several types of wiper blades - maybe you can adapt them.

 

[imrealdumb]

That's a great idea. I tried looking for some type of rubber seal/gasket at Home Depot, but no dice.

Thanks.

 

[marcusl]

Don't know if this geometry would work for you, but if you had two tanks you could connect them with a short length of PVC pipe that has a ball valve in the center. Ball valves can be opened completely and suddenly, and you can get them in substantial sizes (up to 2" and 3" diameter pipe) at home centers.