Physostomes can release air in order to decrease the tension in the gas bladder that may cause internal injuries to other vital organs. Sonar operators, using the newly developed sonar technology during World War II, were puzzled by what appeared to be a false sea floor — metres deep at day, and less deep at night. Compact and Portable — 9 lb. A tire pressure gauge placed on the valve at the top of the tank can check the pressure. During intense exercise, the oxygen in the blood gets used by the skeletal muscle before the blood reaches the heart. Installs in 10 minutes or less Systems are cut to length, pre-assembled and individually packaged for easy installation More representative data Eliminates the risk of cross contamination and is an EPA approved method for VOC collection Saves time!