By the surface energy theory, the difference of solid-liquid surface free energy become bigger as vacuum increases.This is good to dropwise condensation. 根據表面能理論分析可知，真空度越大，等離子管表面的固液表面自由能之差越大，凝結朝著有利於珠狀凝結的方向發展。
By the surface energy theory, the difference of solid-liquid surface free energy become bigger as vacuum increases.This is good to dropwise condensation. 根據表面能理論分析可知，真空度越大，等離子管表面的固液表面自由能之差越大，凝結朝著有利於珠狀凝結的方向發展。
