I'm making a microbial fuel cell out of benthic mud and salt water in containers. My salt bridge will be made of agar and table salt solidified in PVC pipes. Does the salt bridge connecting the anode (benthic mud) and cathode (salt water) have to be full of the agar-salt solution, or can it be partly full?

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    $\begingroup$ I'm voting to close this question as off-topic because it has no apparent relationship to biology. $\endgroup$ – David Feb 25 at 20:22

Main function of the salt bridge is to conduct electrons. It should be in such a way that the agar within the PVC pipe from both end should be in contact with anode and cathode. so I would say keep it completely filled for better conduction.

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  • $\begingroup$ Depending on the rate and duration of reaction the salt bridge will have to be more concentrated or more full. $\endgroup$ – Ark Lomas Jun 25 at 9:52

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