And so, essentially because double bonds create these kinks, these deviations in the geometry of the fatty acid, what that does is it decreases the intermolecular traction between the molecules, the fatty acids, and that decreases the melting point because we have to input less energy to break those intermolecular bonds, because we have less of those bonds and ultimately, because the fatty acids don't attract as well as a result of these double bonds. Increasing the number of double bonds in the fatty acid not only lowers the melting point, it also increases the fluidity of that fatty acid. So unsaturated fatty acids have a lower melting point due to weaker intermolecular interactions. Less energy must be input to actually break those weaker bonds. And so that means a lower melting point. Now, the weaker the intermolecular bonds are, the less likely they are actually held together.