title: [Air or helium comparison pycnometer].
mesh_terms: D000388:Air; D002627:Chemistry, Physical / Q000295:instrumentation*; D003720:Densitometry; D006371:Helium; D011208:Powders; D013678:Technology, Pharmaceutical
chemical_list: D011208:Powders; D006371:Helium
vernacular_title: Le pycnomètre à comparaison d'air ou d'hélium.