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Liquid water, at ambient conditions, has short-range density correlationswhich are well known in literature. Surprisingly, large scale moleculardynamics simulations reveal an unusually long-distance correlation in`longitudinal' part of dipole-dipole orientational correlations. It isnon-vanishing even at 75 \AA{} and falls-off exponentially with a correlationlength of about 24 \AA{} beyond solvation region. Numerical evidence suggeststhat the long range nature of dipole-dipole correlation is due to underlyingfluctuating network of hydrogen-bonds in the liquid phase. This correlation isshown to give a shape dependant attraction between two hydrophobic surfaces atlarge distances of separation and the range of this attractive force is inagreement with experiments. In addition it is seen that quadrupolarfluctuations vanish within the first solvation peak (3 \AA{})

Long Distance Correlations in Molecular Orientations of Liquid Water and Shape Dependant Hydrophobic Force