First slide

Thermal expansion

Question

A platinum wire can be sealed through glass, but a brass wire cannot be sealed in glass because

Easy

A

Platinum has greater density than brass
B

Platinum and glass have the same value for coefficient volume expansion
C

Platinum is an element while brass is an alloy
D

Platinum does not rust

Solution

To avoid cracks , the material of the wire and glass should have the same coefficient of volume expansion.Coefficient of volume expansion for glass and brass are different but for glass and platimum,coefficient of volume expansion are the same.Hence option (2) is right.

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