Local disjoining pressure has been calculated for dispersion forces inside a symmetric circular plane-parallel empty slit. In contrast to the asymmetric case, the local disjoining pressure in a symmetric slit is defined unambiguously. The edge effects in the symmetric slit have been shown to be substantially stronger than those in the asymmetric one. The data obtained have been compared with the published results of the approximate calculation of averaged disjoining pressure. The approximate approach has been revealed to underestimate the absolute value of the correction to the averaged disjoining pressure by nearly 10%.
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