Chemistry

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Liquid Ethylene Density Calculator.

Estimate liquid density with the Rackett equation using entered critical properties and fluid coefficients.

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Set your values

Results update as you type.

How to Use

Vₘ = (R Tᶜ / Pᶜ) Zᴿᴬ^(1 + (1 − T/Tᶜ)^(2/7)); ρ = M/Vₘ.

Every material coefficient and convention is an input. No element, fluid, lab-method, or safety database is queried; results update after a short debounce.

Use Cases

Process Engineering Design

Quickly estimate ethylene liquid density for piping, storage, or flow calculations without experimental data.

Example: Estimate density at 250 K using critical properties from a handbook.

Educational Reference

Demonstrate the Rackett equation in thermodynamics or chemical engineering coursework.

Example: Compare calculated density with literature values for ethylene.

Frequently Asked Questions

What is the Rackett equation used for in this calculator?
The Rackett equation estimates liquid density from critical temperature, critical pressure, acentric factor, and a fluid-specific coefficient. This calculator applies it specifically to ethylene, using your entered values to compute density at a given temperature.
What inputs do I need to provide?
You need to enter the critical temperature, critical pressure, acentric factor, and the Rackett coefficient for ethylene. The calculator uses these to estimate liquid density. Ensure units are consistent (e.g., K, bar, etc.) as per your source data.
How accurate is the density estimate?
Accuracy depends on the quality of the input parameters and the temperature range. The Rackett equation is reliable for saturated liquids away from the critical point. For best results, use experimentally determined coefficients and verify with reference data.

Tips & Common Mistakes

Tips

  • Use consistent units for all inputs (e.g., Kelvin for temperature, bar for pressure) to avoid conversion errors.
  • Verify the Rackett coefficient for ethylene from reliable sources; it may vary slightly with temperature range.
  • For temperatures close to the critical point, the Rackett equation becomes less accurate; consider alternative methods.
  • Cross-check your result with known density values for ethylene to ensure inputs are correct.

Common Mistakes to Avoid

  • Using the acentric factor of a different compound instead of ethylene's.
  • Forgetting to convert temperature to Kelvin if using Celsius or Fahrenheit.
  • Misinterpreting the Rackett coefficient as a constant independent of temperature; it may be temperature-dependent.

Last updated: August 13, 2026