Question

Which of the following materials has nearly zero coefficient of expansion?

• A. Selenium
• B. Invar
• C. Silver
• D. Stainless steel

Answer 1

Answer:

B. Invar

Invar, an alloy of Nickel and Iron, has the nearly zero coefficient of expansion. The coefficient of expansion is the ratio of increase in length, area or volume to its original length, area or volume when the material is heated by 1 degree Celsius or Kelvin.