Simplify the following text for a Grade 11 native English-speaking person.
Original: Centrifugal compressors use a vaned rotating disk or impeller in a shaped housing to force the gas to the rim of the impeller , increasing the velocity of the gas .
Simplified: Centrifugal compressors use a rotating disk or impeller in a shaped housing to force the gas to the rim of the impeller , increasing the velocity of the gas .