Antoine equation

Code snippets

curl "https://api.oanor.com/vaporpressure-api/v1/antoine" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/vaporpressure-api/v1/antoine", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/vaporpressure-api/v1/antoine");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/vaporpressure-api/v1/antoine",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "mode": "pressure_from_temperature",
        "note": "Antoine: log10(P) = A - B/(C + T). With the default water constants T is in °C and P in mmHg (water boils at 760 mmHg at 100 °C).",
        "inputs": {
            "a": 8.07131,
            "b": 1730.63,
            "c": 233.426,
            "temperature": 100
        },
        "pressure": 760.086369,
        "log10_pressure": 2.88086294,
        "constants_source": "water (default)"
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:32.225Z",
        "request_id": "c73f7863-d7c6-4864-9e5e-d6fd61ae7788"
    },
    "status": "ok",
    "message": "Antoine equation",
    "success": true
}