RPM
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Definition
RPM (revolutions per minute) is a unit of rotational speed measuring how many complete turns an object makes in one minute.
Explanation
A typical car engine idles at 600–900 RPM and redlines at 6,000–8,000 RPM. Hard disk drives traditionally spin at 5,400 or 7,200 RPM. Dental drills reach 400,000 RPM; household blenders run at 15,000–20,000 RPM. To convert RPM to radians per second (angular velocity), multiply by 2π/60: 1 RPM ≈ 0.1047 rad/s.
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RELATED TERMS
Torque
Torque is the rotational equivalent of force, equal to the applied force multiplied by the perpendicular distance from the pivot point, measured in newton-meters (N·m) or pound-feet (lb·ft).
Stress
Stress is the internal force per unit area within a material resulting from externally applied forces, measured in pascals (Pa) or pounds per square inch (psi).
Strain
Strain is the dimensionless ratio of a material's deformation (change in length) to its original length under applied stress: ε = ΔL/L₀.
Viscosity
Viscosity is a fluid's resistance to deformation or flow, quantifying internal friction between fluid layers; dynamic viscosity is measured in pascal-seconds (Pa·s) or centipoise (cP).
Tensile Strength
Tensile strength is the maximum stress a material can withstand while being stretched before it fractures, measured in megapascals (MPa) or pounds per square inch (psi).