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.
It is not a solid, not a gas, and not quite a liquid either. Generally, it is classified as a rigid liquid, maintaining liquid properties while acting like a solid. Heat can return it to a liquid and workable form, making it easy to reuse and recycle. There are many reasons that glass is a favored material.