The Money Ok on Instagram: "A rare and extremely dense gas called sulfur hexafluoride (SF₆) behaves in a way that feels almost impossible when compared to normal air. Instead of rising or mixing evenly, it settles at the bottom like an invisible liquid because it is more than five times heavier than air. When lightweight objects are gently placed on top, they appear to float, even though there’s no solid surface beneath them. This illusion happens due to density and buoyancy. SF₆ molecules are t