转速（RPM）
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定义
RPM（每分钟转数）是衡量物体每分钟完成完整旋转次数的转速单位。
解释
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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