Pressure can be defined as the rate of change of energy with volume, p = ∂E/∂V. Similarly, the surface analogue of pressure, surface tension, is defined as the rate of change of energy with surface area a, σ ≡ ∂E/∂a at constant volume. Ignoring the effects of symmetry,Coulomb, and pairing energies, compute the surface tension of a nucleus as described by the empirical parameters of the SEMF. The surface tension acts to keep a nucleus spherical.