Why is it easy to remove air from balloon and is difficult to remove air from glass bottle

Which of the following correctly describes the early view of catastrophism?

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.