A Complete Collection of 100000 Whys
Fav十万个为什么
为什么瓶装水保质期长达一年？
简单的摘要：瓶装水保质期长达一年主要因为水的化学性质稳定、包装材料阻隔性强以及密封性好。
1、水的化学性质稳定：水的化学结构简单且稳定，不容易与其他物质发生反应，因此自身不易变质。
2、包装材料阻隔性强：瓶装水通常使用塑料（如PET）或玻璃等材料，这些材料能有效阻挡氧气、光线和微生物进入瓶内，保持水的纯净。
3、密封性好：瓶装水的瓶盖设计密封性能优良，防止空气和外部污染物进入瓶内，确保水质安全。
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