Liquid is poured into a U-shaped tube of length 2L sealed at one end in such a way that air remains in the right sealed elbow. The fluid level in the open elbow coincides with the edge of the tube. The difference between the levels is L/3 (Fig. 79). What part of the liquid must be released through the valve at the bottom of the vessel so that the liquid levels in the open and closed elbows are equal? Neglect the vapor pressure of the liquid. Liquid density p, atmospheric pressure P0.

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