標準重力加速度
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定義
地球表面における名目上の重力加速度で、正確に9.80665 m/s²と定義され、重量キログラムの定義や重量測定の標準化に用いられる。
解説
Actual surface gravity varies from 9.764 m/s² at the equator to 9.863 m/s² at the poles due to Earth’s rotation and non-spherical shape. The standard value of 9.80665 m/s² was adopted in 1901 to provide a consistent reference for force unit conversions: one kilogram-force equals exactly 9.80665 newtons. Spring scales calibrated for standard gravity will read about 0.5% high at the equator.
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