科学的記数法
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定義
1から10の間の係数に10のべき乗を掛けて数値を表す方法（例：6.022 × 10²³）。
解説
Scientific notation keeps calculations tractable across extreme scales. The mass of an electron is 9.109 × 10⁻³¹ kg; the mass of the Sun is 1.989 × 10³⁰ kg — both unwieldy in standard form. Multiplying them requires only adding exponents: 10⁻³¹ × 10³⁰ = 10⁻¹.
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