Question

A steel rod has a length of l0m at a temporture of 25C°. Calculate the increase in length if heated to 35C°​

Answer 1

Explanation:

A steel rod has a length of exactly 0.2 cm at 30 degrees Celsius. What will be its length at 60 degrees Celsius?

Mental arithmetic time.

The linear thermal expansivity of mild steel is around 12 x 10⁻⁶ k⁻¹ (known in some fields as 12 microstrain per kelvin).

We have an increase of 30 K, so that means we have a strain of 360 x 10⁻⁶ or 0.36 x 10⁻³.

So, we calculate 2 mm x (1 + 0.36 x 10⁻³) = 2 mm + 0.00072 mm = 2.00072 mm

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