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.
Hg (inches of mercury) or 14.696 psi (pounds per square inch). This means that, at sea level, the weight of air pressing on every square inch of something is almost 15 pounds. Something to think about: If you had 1 square inch of room-temperature mercury that was 29.92 tall, it would weigh ... 14.696 pounds! Again, these are the average atmospheric pressures only at sea level.