Vaisesika Sūtra 3.2.05

तस्य द्रव्यत्वनित्यत्वे वायुना व्याख्याते ॥५॥

tasya dravyatva-nityatve vāyunā vyākhyāte ॥5॥

[तस्य (tasya) - of it; द्रव्यत्व (dravyatva) - substantiality; नित्यत्वे (nityatve) - and eternality; वायुना (vāyunā) - by breadth; व्याख्याते (vyākhyāte) - are explained;]

Its substantiality and eternality are explained by breadth.