Dry ice (frozen carbon dioxide) removes oxygen.
Dry ice's ability to displace oxygen makes it useful in various applications. It sublimates – transitions directly from solid to gas – releasing carbon dioxide gas. This carbon dioxide then pushes out the oxygen in an enclosed space. This technique is commonly used for:
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Food Preservation: For storing grains, legumes, powdered milk, and other food items at home, dry ice creates an oxygen-deprived environment, preventing spoilage and insect infestation.
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Insect Treatment: Similarly, it can eliminate insects in stored products by suffocating them.
The process is economical, making dry ice a practical solution for oxygen removal. However, users must exercise caution because carbon dioxide is an asphyxiant and can be dangerous in poorly ventilated areas.
