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"rpm" vs "rpm."

Both "rpm." and "rpm " are correct, but they are used in different contexts. "rpm." is used when referring to revolutions per minute in a technical or scientific context, where the period is necessary. "rpm " is used when mentioning revolutions per minute in a more casual or general context.

Last Updated: March 30, 2024

rpm

This is correct when mentioning revolutions per minute in a casual or general context.

Use "rpm " when talking about revolutions per minute in casual or general contexts without the need for a period after the abbreviation.

Examples:

  • The car's engine runs at 3000 rpm
  • The record player spins at 45 rpm

Alternatives:

  • revolutions per minute
  • rev/min
  • rev/min.
  • rotations per minute
  • rotations/min

rpm.

This is correct when referring to revolutions per minute in a technical or scientific context where the period is necessary.

Use "rpm." when writing about revolutions per minute in technical or scientific contexts to indicate the abbreviation with the necessary period.

Examples:

  • The engine's maximum speed is 5000 rpm.
  • The fan rotates at 1200 rpm.

Alternatives:

  • revolutions per minute.
  • rev/min.
  • rev/min
  • rotations per minute.
  • rotations/min.

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