1. The document discusses stresses and strains in thin cylindrical and spherical shells due to internal pressure. It provides formulas to calculate hoop stress, longitudinal stress, circumferential strain, and changes in diameter, length, cross-sectional area, and volume of shells. 2. As an example, it calculates the hoop stress, longitudinal stress, and circumferential strain in a cylindrical shell with given dimensions and internal pressure. 3. It also calculates the circumferential stress in an aluminum alloy pressure hull with given dimensions, material properties, and operating depth.

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