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The surface tension of liquid 4 He is 0.35 mN/m and the liquid density is 145 kg/m 3 . Estimate (a) the number of atoms/ m 2 in the surface and (b) the energy per bond, in eV, in the liquid at this temperature. The moss of a helium atom is 6.64 × 10 -27 kg. Picture each atom as a cube and assume that each atom interacts only with its four nearest neighbors.
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