In $∆{\mathrm{T}}_{\mathrm{b}}={\mathrm{K}}_{\mathrm{b}}\times \frac{{\mathrm{W}}_1\times {\mathrm{M}}_2}{{\mathrm{M}}_1\times {\mathrm{W}}_2},{\mathrm{K}}_{\mathrm{b}}$ is known as

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