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GET /v1/enthalpy

Enthalpy of vaporization

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/vaporpressure-api

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Code snippets

curl "https://api.oanor.com/vaporpressure-api/v1/enthalpy" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/vaporpressure-api/v1/enthalpy", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/vaporpressure-api/v1/enthalpy");
curl_setopt($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/enthalpy",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "Two-point Clausius–Clapeyron solved for ΔHvap = -R·ln(P2/P1)/(1/T2 - 1/T1). Temperatures in kelvin, pressures in any consistent unit.",
        "inputs": {
            "p1": 101325,
            "p2": 42585,
            "t1": 373.15,
            "t2": 350
        },
        "enthalpy_j_per_mol": 40660.1673,
        "enthalpy_kj_per_mol": 40.660167
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:32.454Z",
        "request_id": "7f1f185f-e0df-4ecc-86b5-761d03cd1992"
    },
    "status": "ok",
    "message": "Enthalpy of vaporization",
    "success": true
}