Which term best describes a measurement of speed in both the English and metric systems?

The term that best describes a measurement of speed in both the English and metric systems is RPM, which stands for revolutions per minute. RPM is commonly used to denote the rotational speed of a machine or tool, indicating how many full rotations it makes in one minute. This measurement applies universally across different systems, making it a standard way to express speed in mechanical contexts.

In mechanics and metal cutting, knowing the RPM of cutting tools is critical for determining cutting speeds and efficiencies. It helps in selecting the appropriate speed for various materials and cutting conditions, contributing to optimal machining performance. Therefore, RPM serves as an essential metric for both English and metric systems, facilitating accurate comparisons and calculations across different measurement standards.