如何将单位的价值转换为其他单位？

问：

我必须将旧单位的值转换为新单位。

旧单位可以是mg/l，新单位可以是ug/ml。oldValue 为 8 mg/l。当我使用谷歌的转换器时，它向我显示该值没有改变。在我的计算中，该值从 8mg/l 变为 1 ug/ml，这绝对是错误的。

很可能我使用了不正确的公式来计算新值。

这是我目前的方法：

首先，我声明了带有对象和效力的可能单位：

  private potenciesMass = {
    kg: 1,
    g: 1000,
    mg: 1000000,
    µg: 1000000000,
    ug: 1000000000,
    pg: 1000000000000,
  };

  private potenciesCapacity = {
    l: 1,
    dl: 10,
    ml: 1000,
    ul: 1000000,
    nl: 1000000000,
    pl: 1000000000000,
    fl: 1000000000000000,
  };

在下一步中，我读出每个单位的效力，并用它们计算新值。最后，我将这两个值相除。

 let potencyFirstOld = this.getPotencyValue(oldUnitSplitted[0]);
        let potencyFirstNew = this.getPotencyValue(newUnitSplitted[0]);

        // Second Unit
        let potenceySecondOld = this.getPotencyValue(oldUnitSplitted[1]);
        let potenceySecondNew = this.getPotencyValue(newUnitSplitted[1]);

        let firstValue = this.convertMultipleTypes(
          potencyFirstOld,
          potencyFirstNew,
          value
        );

        let secondValue = this.convertMultipleTypes(
          potenceySecondOld,
          potenceySecondNew,
          value
        );

        value = firstValue / secondValue;

有谁知道我如何按单位将旧值转换为新值？

编辑：新代码

  private convertMultipleTypes(
    potencyOld: number,
    potencyNew: number,
    value: number
  ): number {
    let potenceDifference = 0;
    let potence: number;

    if (potencyOld < potencyNew) {
      potenceDifference =
        potencyNew.toString().length - potencyOld.toString().length;
      potence = this.calculatePotence(potenceDifference);
      return value / potence;
    }

    potenceDifference =
      potencyOld.toString().length - potencyNew.toString().length;
    potence = this.calculatePotence(potenceDifference);
    return value * potence;
  }

  private calculatePotence(potenceDifference: number): number {
    let potence = "1";

    for (let i = 0; i < potenceDifference; i++) {
      potence += 0;
    }

    return Number(potence);
  }