Acetylene cylinders that have been lying on their sides must stand upright for at least ____ hours before they are used.
A) two
B) three
C) four
D) five

Name: Acetylene cylinders that have been lying on their sides must stand upright for at least ____ hours before they are used. A) two B) three C) four D) five
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Question

Quizplus · Accepted Answer

Acetylene cylinders that have been lying on their sides must stand upright for at least four hours before they are used to allow the acetone to settle to the bottom of the cylinder.

Acetylene Cylinders That Have Been Lying on Their Sides Must