61. In a cylinderical vessel subjected to internal pressure, the longitudinal stress $${\sigma _{\text{L}}}$$ and the circumferential stress, $${\sigma _{\text{h}}}$$ are related by
62. A binary liquid azeotropic mixture has boiling point higher than either of the components, when it shows __________ deviation from Raoult's Law.
63. A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult's Law.
64. Vapor velocity in a distillation column for non-foaming mixture is in the range of __________ times the flooding velocity.
65. The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.
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