Why? Well, because a higher amount of energy. So high temperature must actually be used to actually get that well defined structure that exists due to those intermolecular interactions to actually collapse. And so we conclude that a membrane with strong intermolecular interactions will have a higher melting temperature than a membrane with weaker ones. So again, a stronger or stronger interactions basically implies a more rigid, more well defined and ordered structure and that implies a higher melting temperature. Now, we know that membrane fluidity is determined by the relative movement of those lipids and the other molecules in the membrane.