An evaluation of water-vapor output from four brands of unheated, prefilled bubble humidifiers.

We evaluated the water-vapor output from four brands of unheated, prefilled bubble humidifiers-the Aerwey 300, the Aquapak 301, the McGaw 250, and the Travenol 500-at oxygen flowrates of 2, 4, 6, and 81/min. We recorded relative humidity (RH) and temperature in a test chamber at intervals over a minimum period of 24 h, and we calculated water-vapor content (WVC) and corresponding RH at 37 degrees C. Ambient RH was 53.

Effect of Mixing Rate on HF Chemical Laser Performance.

A simple model of a steady-flow HF chemical laser has been formulated in which the excited-state formation rate is limited by the H(2)-F mixing rate. Lasing is allowed to take place between several vibrational levels of the HF molecule simultaneously. With reasonable approximations, the power output and efficiency can be determined analytically.