When a long glass capillary tube of radius 0.015 cm is dipped in a liquid, the liquid rises to a height of 15 cm within it. If the contact angle between the liquid and glass to close to 0°, the surface tension of the liquid, in milli Newton m^-1, is__________ $[{\mathrm{\rho }}_{\left(\mathrm{liquid}\right)}=900{\mathrm{kgm}}^{-3},\mathrm{g}=10{\mathrm{ms}}^{-2}]$ (Give answer in closest integer)