(under subclass 704) Subject matter wherein the sensing device is responsive to (a) a state of matter being of an aeriform fluid having an ability to spread out and occupy an entire enclosure in which it is present or (b) an aeriform fluid having particles of liquid mixed within having an
ability to spread out and occupy an entire enclosure in which it is present.
(1) Note. Vapor may also be called fog, mist, humidity, or steam.
SEE OR SEARCH CLASS
73, Measuring and Testing, for the measuring and testing of fluid pressure.
