The discontinuous change in free volume will involve an abrupt change of the permeability of the breathable material layer.

所述自由体积的不连续变化会涉及所 述透气材料层的渗透性的突然变化。

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We Establish regional model of the indoor fire, make hypothesis on the gas density uniformity and on discontinuous cold hot air layer and on indoor and outdoor equal etc.

建立室内火灾的区域模型，作气体浓度均匀、冷热空气层不连续、室内外等压的相关假设。

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