Physics

Thermal Expansion Calculator

Find length change from temperature.

Original length

Expansion coefficient (/°C)

Temperature change (°C)

Calculated Output

Length change 0.006

New length 10.006

Formula: ΔL = L · α · ΔT

Step-by-Step Breakdown

1. Values used:

2. Original length = 10

3. Expansion coefficient = 0 /°C

4. Temperature change = 50 °C

6. Length change = Original length x Expansion coefficient x Temperature change = 10 x 0 x 50 = 0.006

7. New length = 10.006

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The math behind it

ΔL = original length × expansion coefficient × temperature change. Steel ≈ 12×10⁻⁶ /°C.

10 m steel +50 °C → +6 mm.

Why expansion joints?

To absorb this expansion in bridges and rails.