It means he thinks you are lovely. that's a beautiful compliment, but it doesnt necessarily have to mean more than that. It means he secretly likes you and doesn't have the courage to tell you that he likes you to your face. could just be flirting to see what you're reaction would be like.
Medical air is also used during anesthesia as a substitute for nitrous oxide to reduce the high concentration of oxygen exposure. While the source of medical air may be a manifold with a bank of compressed air cylinders, most hospitals use a compressor system. This article will refer to installations with air compressors. An illustration of a typical medical air plant is provided for your reference throughout this article's discussion.
air compressor - a compressor that takes in air at atmospheric pressure and delivers it at a higher pressure. piston chamber, cylinder - a chamber within which piston moves. mechanical device - mechanism consisting of a device that works on mechanical principles. supercharger - compressor that forces increased oxygen into the cylinders of an internal-combustion engine.