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Fav十万个为什么
为什么吹大的气球会逐渐变小？
吹大的气球会逐渐变小，主要是因为气球材料具有透气性，气体分子会缓慢泄漏，以及气球材料在拉伸后存在应力松弛现象。
1、材料透气性：气球通常由橡胶或乳胶等材料制成，这些材料具有一定的透气性，小分子气体如氦气会缓慢通过材料分子间的空隙泄漏出去。
2、应力松弛：气球被吹大后，橡胶分子处于紧张状态，随着时间的推移，材料会发生应力松弛，导致气球内部压力下降，体积缩小。
3、气体扩散：即使气球材料完全不透气，气球内部的气体也会因浓度梯度而逐渐扩散到外部空气中，导致气球体积减小。
总结：吹大的气球会逐渐变小，主要是因为气球材料具有透气性，气体分子会缓慢泄漏，以及气球材料在拉伸后存在应力松弛现象。
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