How Does Water Affect the Inductance of a Coil?

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The discussion focuses on how the presence of water in a coil affects its inductance, specifically for a coil with an inductance of 0.1 mH. Participants question the mechanisms behind changes in inductance when water fills the coil's core, suggesting that the impact may be more related to capacitance than inductance. There is a mention of using this setup as an improvised water level sensor in a glycol system. Suggestions include researching water level sensor circuits for better understanding. The conversation emphasizes the need to consider the electrical properties of water in relation to coil design.
Yuri B.
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water as coil "core"

How much a coil inductance of 0.1 mH (3 cm long, some 50 turns wound around 5 cm diameter empty plastic pipe) may change when water enters the pipe ?
 
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Yuri B. said:
How much a coil inductance of 0.1 mH (3 cm long, some 50 turns wound around 5 cm diameter empty plastic pipe) may change when water enters the pipe ?

What are your thoughts? What mechanism would give a change in inductance? I this a schoolwork question?
 
I need to empty an actually water glycol-system but I do not want to remove all but to a certain level. It would be an improvised level sensor.
 
Yuri B. said:
I need to empty an actually water glycol-system but I do not want to remove all but to a certain level. It would be an improvised level sensor.

You should perhaps be looking at capacitance, not inductance. Try a Google search for water level sensor circuits...
 

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