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Measuring how strong these fields really are would test those explanations.","posed_since":"","precise":"Determine the mean electric field projected on a probe bond at the water-air and water-oil interfaces at 300 K, from vibrational Stark shifts of interface-specific probes and from ab initio molecular dynamics, and compare with bulk water. The answer is the field magnitude (reported values range up to about $3 \\times 10^{4}\\,\\mathrm{statvolt}/\\mathrm{cm}$) with its spatial profile across the interface.","problem_ref":"3c9b931ca2f0ca0c52a6b8f9edaa112b208c6c313d581b510ab79e89bee08e47","references":"","settled_by":"Surface-selective vibrational Stark spectroscopy calibrated against bulk and ab initio simulations with the same probe.","status_note":"","title":"Magnitude of the electric field at water-hydrophobic 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