What is the purpose of RPMs?

Related questions

1. Does lower rpm save gas?
2. Does revving engine charge battery faster?
3. Is revving a car illegal?
4. Is Revving an engine bad?
5. Is it bad to drive with high rpm?
6. What is a good RPM for a car?
7. Is RPM supposed to be at 0?
8. What does it mean when RPMs are high?
9. What RPM gives best mileage?
10. How is RPM related to speed?

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