Go Wild! with Our Central PA Zoo Activities. For over 50 years, Lake Tobias Wildlife Park has been providing entertainment and education to the families of central Pennsylvania. We offer a wide variety of activities for our visitors, all centered around engaging encounters with our exotic animals.
Phase changes happen when you reach certain special points. Sometimes a liquid wants to become a solid. Scientists use something called a freezing point or melting point to measure the temperature at which a liquid turns into a solid. There are physical effects that can change the melting point. Pressure is one of those effects.
Presumably, in order to cause a solid to convert to a liquid, or a liquid to a gas, the ions, atoms, or molecules that occupy the lattice positions of the solid must be given sufficient energy to overcome the forces that hold them in their lattice positions.