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J. Haynes. Note on the existence of negative pressures. In The role of fundamental research in paper-making, Trans. of the VIIth Fund. Res. Symp. Cambridge, 1981, (Fundamental Research Committee, ed.), pp 738–741, FRC, Manchester, 2018.


The mechanical equilibrium of two fluids separated by a curved interface requires the existence of a hydrostatic pressure, Δp between them; this is given by the Laplace equation:
Δp = -yc

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