ForHosting KIT · Science

Liquid ethylene density calculator

Find how dense liquid ethylene is wherever you measure it: at its normal boiling point of 169.4 K the saturated liquid weighs 568.874115703 kg/m³, and any value between 104 K and the critical 282.35 K is covered. Free in your browser.

Free
Runs in your browser
No sign-up
Your data stays on your device

Run — free How it works & API

Use it from WebAPIEmailTelegramApp soon

Worked example

If you enter

Creativity: 169.4

You get

Density: 568.874115703
Reduced temperature: 0.599964583

Liquid ethylene (ethene, C2H4) is stored, transferred, and metered as a cryogenic or pressurized liquid, and its mass per cubic metre changes sharply with temperature as the fluid approaches the critical point near nine degrees Celsius. Process engineers, tank designers, and custody-transfer scripts need a deterministic density at a stated kelvin temperature without pulling a full equation-of-state library.

Why liquid ethylene density depends on temperature, and the Rackett correlation

Saturated liquid ethylene is the dense phase of ethene that exists between the triple point near one hundred four kelvin and the critical temperature of two hundred eighty-two point three five kelvin. Along the vapour-liquid saturation line the liquid density falls smoothly from roughly six hundred fifty kilograms per cubic metre near the triple point to the critical density of about two hundred fourteen kilograms per cubic metre, because thermal expansion and the vanishing distinction between liquid and vapour both increase molar volume as temperature rises.

Chemical engineering practice correlates that curve with the modified Rackett equation of Spencer and Danner: the saturated molar volume equals R times Tc over Pc, multiplied by the Rackett compressibility ZRA raised to one plus one minus T over Tc to the power two-sevenths, and mass density is molar mass divided by that volume.

For ethylene the constants are the recommended molar mass zero point zero two eight zero five three two kilograms per mole, Tc of two hundred eighty-two point three five kelvin, Pc of five point zero four one eight megapascals, and ZRA of zero point two eight one two, which recovers the critical density at Tc and matches handbook liquid densities near the normal boiling point of one hundred sixty-nine kelvin.

This calculator evaluates that identity only; it does not integrate a Helmholtz equation of state, does not take pressure as an independent variable, and does not apply to supercritical ethylene or to the vapour. Use it when you need a standard temperature-density correlation for the saturated liquid, not a full PVT table for every pressure.

Where a liquid ethylene density figure earns its keep

Olefin plants, cryogenic storage, and polymer-feed systems meter liquid ethylene by volume and convert to mass with density at the measured temperature. A dedicated liquid ethylene density calculator lets operators, students, and custody scripts obtain that factor without embedding DIPPR tables or calling a process simulator for a single-component saturated liquid. Validation failures never consume balance.

Pair the density with a volume reading to estimate inventory mass, or with a flowmeter reading when the meter reports cubic metres and you need kilograms. The model is the saturated-liquid Rackett correlation: it does not correct for subcooling under high pressure, does not handle ethylene-rich mixtures, and does not replace a custody-transfer equation of state required by a commercial contract. Those limitations are intentional so the landing matches the search intent liquid ethylene density as a function of temperature.

What you can do with it

Cryogenic tank inventory

Convert a measured liquid-ethylene volume to mass using density at the tank temperature instead of a single handbook value at the boiling point.

Olefin-plant mass balance

Turn volumetric flow of refrigerated ethylene into kilograms per hour for yield, flare, and polymer-feed accounting at the actual process temperature.

Homework and lab checks

Students evaluate saturated liquid C2H4 density from kelvin temperature and compare against steam-table style handbook numbers without a process simulator.

FAQ

How do I calculate liquid ethylene density with this tool?

The response density is the saturated liquid mass density in kg/m³ from the modified Rackett correlation.

What temperature range is valid?

The correlation covers liquid ethylene from 104 K (triple point) through 282.35 K (critical temperature).

Is temperature in Celsius or kelvin?

Kelvin only. Convert Celsius with T(K) = t(°C) + 273.15 before calling. The normal boiling point of ethylene is about 169.4 K (−103.7 °C).

Does pressure enter the calculation?

No. This product is a temperature-density correlation for saturated liquid ethylene. Subcooled liquid at high pressure and supercritical fluid need a different equation of state.

How do I turn a tank volume into a mass of ethylene?

Multiply the volume in cubic metres by the density at the measured temperature. The same works for a flowmeter that reports cubic metres when you need kilograms for inventory or a mass balance.

Related tools

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/chem/liquid-ethylene-density

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/chem/liquid-ethylene-density \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"temperature":169.4}'

const res = await fetch("https://api.kit.forhosting.com/chem/liquid-ethylene-density", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "temperature": 169.4
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/chem/liquid-ethylene-density",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "temperature": 169.4
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/chem/liquid-ethylene-density", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"temperature":169.4}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"temperature":169.4}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/chem/liquid-ethylene-density", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "temperature": 169.4
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "chem.liquid_ethylene_density",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Technical notes

This liquid ethylene density calculator evaluates the modified Rackett temperature-density correlation with ethylene's recommended critical constants, returns density in kilograms per cubic metre, and rejects temperatures outside the liquid range from the triple point to the critical temperature with a clear invalid_input error.

Input contract, valid temperature range, and the density response

The correlation is valid from one hundred four kelvin, the triple-point lower bound, through two hundred eighty-two point three five kelvin, the critical temperature, inclusive of both ends. Missing, empty, non-finite, or non-numeric values fail the same way and are not billed. A typical check at the normal boiling point, temperature equal to one hundred sixty-nine point four kelvin, returns a liquid density near five hundred seventy kilograms per cubic metre, which is the figure tank-volume and mass-balance calculations use when ethylene is stored as a boiling liquid at atmospheric pressure. Send a JSON body with the required field temperature as a finite number in kelvin. Numeric strings are accepted; aliases T, t, temp, and kelvin map onto the same field so notebooks and older forms do not need renaming. Temperatures strictly below one hundred four kelvin would describe solid or a metastable liquid outside the fitted range, and temperatures above the critical point are not liquid ethylene, so those requests fail with invalid_input naming temperature and stating that the value is outside the liquid-ethylene correlation range. On success the response echoes temperature, reports density in kilograms per cubic metre, reports reduced_temperature as T divided by Tc, and includes formula and method labels so a client can display the Rackett identity next to the number.

Where a liquid ethylene density API earns its keep

Use the free in-browser tool for homework, HAZOP sketches, and tank-strap checks; use the prepaid API when a historian, LIMS, or spreadsheet add-in needs the same contract under KIT balance at $0.002 per successful item.

Technical questions

What does the liquid ethylene density calculator cost?

The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.

Read the full KIT documentation →

Run — free