Thermal Properties

Heat Capacity

Change in energy over change in temp

Heat stored by vibrations in atoms (WAVES)

Metals transmit heat through electron movement and vibration

ceramics transmit through vibration

polymers transmit through vibrations, but are really poor conductors of heat

Polymers have highest heat capacity, metals the lowest

On the graph that Alyssa loves, polymers will be the shallowest and ceramics the deepest.

if graph is symmetric, there is no radius growth

Notice that each energy crosses the function at two points. Find the average of those R values

Thermal Conductivity

Thermal conductivity is the sum of thermal conductivity through VIBRATIONS and thermal conductivity through ELECTRONS

Metals have both, so HIGHEST

Ceramics just vibrate, MIDDLE

Polymers just vibrate but shittily, so WORST

Highest crystallinity, highest K

Thermal stresses

Best if PURE

compression and stress on a material that heats up but can't expand

More crystalline, better

Linear or More CRYSTALLINE

The rise in temperature creates compression on the outside, tension inside

Cooling from outside in, so opposite

Ceramics when cooling suck ass since they are so brittle already