ɪɾ ɪz jˈuːzd ɪn ˈɛɹ pjˈʊɹɹɪfˌaɪɚz wˌɛɹ wˈeɪt ɪz ɪmpˈoːɹtənt, ˈiː.dʒˈiː., spˈeɪskɹæft tʊ ɐbsˈoːɹb kˈɑːɹbən daɪˈɑːksaɪd ænd ɹᵻlˈiːs ˈɑːksɪdʒən ɪnðə ɹɪˈækʃən:
It is used in air purifiers where weight is important, e.g., spacecraft to absorb carbon dioxide and release oxygen in the reaction: