劲度，又称弹性系数，刚性系数，特指线性弹簧弹力和轴向变形的比值，数学表示为：
为劲度系数，为弹簧产生的弹力，为伸长量，负号表示弹簧所产生的弹力与其伸长（或压缩）的方向相反。劲度系数的倒数称为力顺。
参见
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