MacRoscopic Properties: The World We SeePhases of Matter and Intensive Properties |
What is a glass? |
A glass is a noncrystalline solid—it lacks order in the solid state. In polymer chemistry, scientists are concerned with the glass transition temperature (Tg), which is the temperature at which a material changes from a hard to a rubbery state. What’s neat about this transition is that the material is not changing phases (i.e., from solid to liquid), but is changing from one type of solid to another.