Ny fiainana dia izay mahasamihafa ireo zavatra mahakojakoja ny tenany (ny zavatra manan'aina) sy ireo zavatra izay tsy mahakojakoja ny tenany, satria na efa nitsahatra ny fikojakojana ny tena (maty), na satria zavatra tsy manana aina.
Fizika hahatakatra dia voafaritra famphenana tamin'ny entropy (fikorontanana) sy fitombo tamin'ny pitsipitsini ny fiainana. Mampiely fikorontanana raha manjary abo pitsipitsini ny fiainana.
Ny zavatra manana aina dia atao hoe "zava-manana aina".
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