Question: When a vertical capillary of length l with the sealed upper end was brought in contact with the surface of a liquid, the level of

When a vertical capillary of length l with the sealed upper end was brought in contact with the surface of a liquid, the level of this liquid rose to the height h the liquid density is p, the inside diameter of the capillary is d, the contact angle is 0, the atmospheric pressure is Po. Find the surface tension of the liquid.

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