| C7-1 | Rubber at low temperature. |
| Purpose: | To demonstrate the change of state. |
| Description: | A piece of rubber hose is cooled in a dewar of liquid nitrogen. The hose is removed and struck with a hammer. The rubber will be very brittle and break into many pieces. Similarly, a rubber ball may be solidified, and when it is thrown to the floor, it will completely shatter. |
| References: | Mk-7 |
| Equipment: | rubber hose, rubber ball, dewar, liquid nitrogen,tong, hammer |