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熱膨張計算機

温度変化による材料の線膨張を求めます。

はじめに

Thermal Expansion Calculator — Linear expansion of a material with temperature. Enter Initial length (m), Expansion coefficient (1/K), Temperature change (K) to get an instant, accurate result.

計算式

Linear thermal expansion is calculated as ΔL = L₀ × α × ΔT, where L₀ is the original length, α is the material's coefficient of linear thermal expansion, and ΔT is the change in temperature.

ステップごとの説明

  1. Enter the Initial length (m).
  2. Enter the Expansion coefficient (1/K).
  3. Enter the Temperature change (K).
  4. Click Calculate to see your result instantly.

実例

Example: With Initial length (m) = 2, Expansion coefficient (1/K) = 0.000012, Temperature change (K) = 30, the Thermal Expansion Calculator gives Delta Length: 0.00072, Final Length: 2.0007.

よくある質問

What is the coefficient of linear thermal expansion?
It is a material-specific property (α) that describes how much a material's length changes per degree of temperature change, typically expressed in units of 1/°C (e.g., steel ≈ 12×10⁻⁶ /°C).
Why do engineers need to account for thermal expansion?
Structures like bridges and railways include expansion joints because materials expand when heated and contract when cooled; ignoring this can cause buckling, cracking, or structural stress.
Does this apply to volume expansion as well?
This calculator computes linear (one-dimensional) expansion. Volumetric expansion is approximately three times the linear coefficient for isotropic materials, since it applies in all three dimensions.
What inputs does the Thermal Expansion Calculator need?
You'll need to provide: Initial length (m), Expansion coefficient (1/K), Temperature change (K). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Thermal Expansion Calculator?
The Thermal Expansion Calculator applies the formula exactly as calculated — Linear thermal expansion is calculated as ΔL = L₀ × α × ΔT, where L₀ is the original length, α is the material's coefficient of linear thermal expansion, and ΔT is the change in temperature. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Thermal Expansion Calculator free to use?
Yes, the Thermal Expansion Calculator is completely free, requires no signup, and runs instantly in your browser.

熱膨張計算機について

The Thermal Expansion Calculator uses a real, verifiable formula — Linear thermal expansion is calculated as ΔL = L₀ × α × ΔT, where L₀ is the original length, α is the material's coefficient of linear thermal expansion, and ΔT is the change in temperature. — so results are accurate every time, not an approximation.