Final answer:
Tube stoppers are typically made of rubber and are used in various applications, including thermos bottles to inhibit heat transfer.
Step-by-step explanation:
True.
Tube stoppers are typically made of rubber. Rubber is a common material used for tube stoppers because it is flexible, durable, and provides a tight seal to prevent leakage. It is also resistant to heat and chemicals, making it suitable for various applications, including thermos bottles.
For example, in the construction of a thermos bottle (as shown in Figure 14.30), rubber is used in the stopper to inhibit heat transfer, thereby maintaining the temperature inside the bottle.