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  • $\begingroup$ That was an interesting question based on daily observation.i hope the brief explanation helps $\endgroup$
    – Sidhi
    Commented Nov 4, 2021 at 12:39
  • 4
    $\begingroup$ You're on the right track, but a couple of things: Oil normally doesn't mix with water, but that is not what stops it from replacing the water that's inside the clay wall. There's some complicated interactions involving surface tension and the "surface energy" of the clay itself. $\endgroup$ Commented Nov 4, 2021 at 15:19
  • $\begingroup$ Thanks,I don't know much as I am in 10th grade now $\endgroup$
    – Sidhi
    Commented Nov 5, 2021 at 8:17