Interval of space- The space between Tanuvāta, Ghanavāta etc., or between the Kṛṣṇarājis, or between the two consecutive netherly earths viz., Ratnaprabhā (the first infernal land) etc...
satta onāsaṃtarā paṇṇattā.
etesuṃ ṇaṃ sattasu ovāsaṃtaresu satta taṇuvāyā paiṭṭhiyā.
(Sthā 7.18,19)
'aṭṭhasu uvāsaṃtaresu' tti dvayorantaramavakāśāntaram.
(Bhaga 6.106 Vṛ)
' avakāśāntarāt' ākāśaviśeṣādavakāśarūpāntarālād vā.
(Bhaga 1.256 Vṛ)