die Drehzahl
Translation
rotational speed, RPM, revs
Examples
Die Drehzahl des Motors ist zu hoch.
The engine's rotational speed is too high.
Bitte reduzieren Sie die Drehzahl der Maschine.
Please reduce the machine's speed.
Grammar Patterns
the rotational speed of sth. ... The rotational speed of the engine is too high.
Similar Words
Synonyms: Umdrehungszahl, Rotationsgeschwindigkeit (rotational speed)
Etymology
A compound noun from 'Dreh-' (from 'drehen', to turn) and 'Zahl' (number). Literally 'turn-number'.
Memory Tips
Break it down: 'Dreh' (turn) + 'Zahl' (number). The number of turns per minute, i.e., RPM. Think of a car's tachometer.