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[交流] 如何计算？

如何计算？
1. Pores with a radius of 5 mm containing insoluble gases of 1 atm pressure are entrapped within a glass with a relative density of 0.90.
what are the equilibrium size of the pores and the final density of the glass?
γs is assumed to be 0.5J/m2.

2.Consider an isolated spherical pore with a radius of 3 mm which was entrapped within a Cu powder compact during pressing at 20C.
Answer whether the pore expands or shrinks at 1000C.
Assume the initial pressure of insoluble gases entrapped within the pore to be 105 N/m2 and the surface energy of Cu at 1000oC to be 1.4 J/m2.

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