At the triple point, l(sublimation) = l(vaporization) - l(fusion).

Question

Quizplus · Accepted Answer

At the triple point, the substance can coexist in all three phases (solid, liquid, and gas) simultaneously, but $l_{\text{sublimation}}$ is not equal to $l_{\text{vaporization}} - l_{\text{fusion}}$. Instead, $l_{\text{sublimation}} = l_{\text{fusion}} + l_{\text{vaporization}}$, because sublimation involves going from solid directly to gas, which is equivalent to first melting (fusion) and then vaporizing.

At the Triple Point, L(sublimation) = L(vaporization) - L(fusion)