High pressure hydraulic pumps then inject fluid at very high pressure inside the aluminum which causes it to expand until it matches the mold.

In thrust vectoring, in jet engine nozzles, swiveling parts are replaced by slots which inject fluid flows into jets to divert thrust.

Injecting fluid tightens the band; removing fluid loosens it.

These include treatments like injecting fluid from the comb on a cockerel's head, and putting honey into joints to speed recovery.

Hypoglycemia and dehydration seem to go hand-in-hand, and force-feeding or injecting fluids may also be necessary.