anal fistula (fistula in aÂ´no) one opening on the cutaneous surface near the anus, which may or may not communicate with the rectum. arteriovenous fistula one between an artery and a vein, either pathologic (such as a varicose aneurysm) or surgically created to ensure an access site for hemodialysis.
1 millibar (or hectopascal/hPa), is equivalent to 0.02953 inches of mercury (Hg). It is therefore only necessary to multiply a reading in millibars by the latter figure, to achieve the required conversion. E.g. for 1023 mbar, multiply by 0.02953=30.21 inches.
Most National Weather Service measurements are given in inches of mercury. At sea level, standard air pressure is 29.92 inches of mercury and 1,013 millibars. Inches of mercury is measured in how high a column of mercury rises in a barometer.One millibar is equivalent to one-thousandth of a single bar, or 1,000 dynes.