单位分析
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定义
将单位视为可乘除和消去的代数量，用以验证方程和进行单位转换的解题技巧。
解释
To convert 60 miles per hour to meters per second: 60 mi/h × 1609.344 m/mi × 1 h/3600 s = 26.82 m/s. The miles and hours cancel algebraically, leaving m/s. Unit analysis also catches errors: if a force equation yields kg·m/s instead of kg·m/s², a factor of time is missing.
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