When a cylindrical capillary glass tube, open at both ends, is vertically inserted in a pool of water, the water level in the tube rises to $7\text{ cm}$ relative to the water level outside the tube. Consider that the surface tension of water is $0.07\text{ N m}^{-1}$ and that the contact angle of water on glass is $0^\circ$. The density of water is $1000\text{ kg m}^{-3}$, and the local acceleration due to gravity is $10\text{ m s}^{-2}$. The diameter of the capillary tube (in $\mu\text{m}$) is __________ (rounded off to the nearest integer).