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Most oxygen concentration machine (for medical usage) are using molecular sieves. It is said polymer can also be employed. But how?

I am looking for some polyester sheet, such as those used in down jacket, with extremely low friction. Any suggestion?

That is useless. It can only be used to measure the thickness of film on a hard surface.

I have access to only one side of the plate, i.e. cannot clamp both sides of the plate to measure. Is there any way, perhaps acoustic methods, to measure a plate thickness from only one side?

Nowadays the consumer refrigerator are all smart controlled including sensors etc. However, each manufacture make their own motherboard, which is not exchangeable. When it went wrong, no where else can purchase a replacement. In view of the computer systems developed in the past 40 years, each...

The valve in the photo has little mechanical parts. It cannot went wrong. However, in the next photo it leaks. Could anyone provide a reason and how can I repair it (instead of replacing one)?