Jisho

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かっせいたん 活性炭
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Noun
1. activated charcoal; activated carbon​
Wikipedia definition
2. Activated carbon​Activated carbon, also called activated charcoal, activated coal or carbo activatus, is a form of carbon that has been processed to make it extremely porous and thus to have a very large surface area available for adsorption or chemical reactions. The word activated in the name is sometimes replaced with active. Due to its high degree of microporosity, just 1 gram of activated carbon has a surface area in excess of 500 m, as determined typically by nitrogen gas adsorption.
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