The capillary tube was lowered into a vessel with water, and then oils were poured onto the surface of the water. What is the height of the oil layer if it is known that its level coincides with the water level in the tube? The surface tension coefficient of water is 0.073 n/m, the density of oil is 0.9 g/cm3, and the radius of the tube is 1 mm. (Assume the contact angle is zero.)
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