Assertion: recreational diving | /r/HasProperty | limited
Facets:
value: generally
type: DEGREE
value: to the use of air
type: CAUSE
Source sentences:
text: Recreational diving is generally limited to the use of air or a single nitrox mixture with an oxygen partial pressure not exceeding 40% for the planned dive, but this does not preclude constant oxygen partial pressure nitrox provided by electronically controlled closed circuit rebreathers like the Poseidon Mk6 or variable nitrox mixtures such as provided by the earlier semi-closed circuit Dräger Ray rebreather.