So you might imagine that in a membrane in which we have more fluidity, we have more movement. And what that means is the attractions are not very strong. But in a membrane in which the attractions between the molecules is strong, that means we're going to have less movement. And so the membrane will be more rigid. And so we see that the stronger the interactions between the molecules in the membrane, the stronger these intermolecular bonds are, the more rigid the membrane is. And conversely, the weaker the interactions are, the less rigid and more fluid that membrane actually is.