A spherical vessel with a volume of 1.00 L was evacuated and sealed. Twenty- four hours later the pressure of air in the vessel was found to be 1.20 × 10^-6 atm. During this 24-h period, the vessel had been surrounded by air at 27^oC and 1.00 atm. Assuming that air is 78 mole percent nitrogen and that the remainder is oxygen, calculate the diameter of the tiny circular hole in the vessel that allowed the air to leak in.