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Galasi ya vacuum ndi mtundu watsopano wa galasi lozama kwambiri, lomwe limapangidwa potengera mfundo ya botolo la thermos. Kapangidwe ka vacuum galasi ndi ofanana ndi galasi dzenje, kusiyana kwake ndi kuti mpweya mu vakuyumu galasi patsekeke ndi woonda kwambiri, pafupifupi pafupi vacuum.