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(color online) Mechanisms for unstable equilibrium for an inelastic encapsulation (a) and stable equilibrium for an elastic encapsulation (b). In (a) increasing or decreasing radius (green dashed line) from the equilibrium (brown solid line) leads to gas movement (radial arrows) to further drive it away from the equilibrium. Corresponding increase or decrease of inside gas concentration Cg causes the gas flux. Opposite happens in (b).
