noun
a type of porous, granular substance used for adsorption and purification purposes
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Activated alumina is commonly used as a desiccant to remove moisture from air and gases.
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Make sure to use activated alumina in the air dryer to keep the moisture levels low.
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Don't forget to toss in some activated alumina to keep things dry and fresh.
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Her presence in the room was like activated alumina, absorbing all the negativity and leaving a sense of purity behind.