How does air pressure in a rocket work

The launch of a compressed air rocket proceeds in three stages; the pressurization of the body tube, the initial acceleration along the launch tube, and the expulsion of the compressed air from the rear of the rocket. Here is a computer animation of the launch of a compressed air rocket

Here is a site if you need more help.  https://spaceflightsystems.grc.nasa.gov/education/rocket/rktstomp.html

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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answer; both surfaces of the membrane are nonpermeable