Chapter 13, Problem 99A

To determine

To Explain: Platinum wire can easily be sealed in a glass tube than copper wire.

Explanation of Solution

Introduction:

A tight metal sealed to glass can be formed only when the coefficient of expansion of both metal and the glass are the same.

Platinum glass holds equal expansion coefficient. It can be packed securely into the tube of glass. Copper’s expansion coefficient is nearly double as compared to glass. For the glass tube, therefore, it can’t shape a tight one.

Conclusion:

Hence, due to expansion coefficient is nearly double than the glass so, it can’t be used.