Question

among the following, substances with a very small coefficient of linear expansion
a)copper
b)iron
c)lead
d)invar
please fast

Answer 1

the coefficient of linear expansion of -

1)copper - 17 x 10^-6
2)iron - 12.0 x 10^-6
3)lead - 29 x 10^-6
4)invar - 1.5 x 10^-6

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correct answer is - 4)invar

Answer 2

Answer:

The substances with a very small coefficient of linear expansion is option (d)invar

Explanation:

• Invar is used where high dimensional strength is needed, such as accuracy mechanisms, clocks, seismic creep gauges, television shadow-mask frames, valves in engines, and large aerostructure molds.

• One of its foremost applications existed in watch balance wheels and pendulum rods for accuracy regulator clocks. At the time it existed invented the pendulum clock stood the globe's numerous precise timekeepers, and the limitation to timekeeping accurateness existed due to thermal deviations in the length of clock pendulums.

• In the manufacture of extensive hybrid material configurations for aerospace carbon fiber layup molds, invar is used to reduce the manufacture of components to exceptionally tight tolerations.

• In the astronomical occupation, Invar is used as the structural element that helps dimension-sensitive optics of astronomical telescopes. The superior dimensional strength of Invar permits the astronomical telescopes to seriously enhance the observance precision and accurateness.

Hence, The substances with a very small coefficient of linear expansion is option (d)invar

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