within a rigid container, e.g. the boundary being formed by a liquid surface

Full Title

Measuring for diagnostic purposes; Identification of persons > Measuring devices for evaluating the respiratory organs > Measuring volume of inspired or expired gases, e.g. to determine lung capacity > the gases being exhaled into, or inhaled from, an expansible chamber, e.g. bellows or expansible bag > within a rigid container, e.g. the boundary being formed by a liquid surface

Classification Context

Section:

HUMAN NECESSITIES

Class:

MEDICAL OR VETERINARY SCIENCE; HYGIENE

Subclass:

DIAGNOSIS; SURGERY; IDENTIFICATION