比例关系
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定义
两个量之间的数学关系，其比值保持恒定（正比）或其乘积保持恒定（反比）。
解释
Ohm’s Law states V = IR: voltage is directly proportional to current when resistance is fixed — doubling the current doubles the voltage. Boyle’s Law (PV = constant) is an inverse proportionality: halving the volume of a gas at fixed temperature doubles its pressure. Proportionality relationships allow prediction of one variable from changes in another without solving a full equation.
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