Egerton's effusion method [¦ej·ǝr·tǝnz ǝ`fyü·zhǝn ´meth·ǝd] THERMODYNAMICS A method of determining vapor pressures of solids at high temperatures, in which one measures the mass lost by effusion from a sample placed in a tightly sealed silica pot with a small hole; the pot rests at the bottom of a tube that is evacuated for several hours, and is maintained at a high temperature by a heated block of metal surrounding it. |