Gas viscosity (Sutherland)

Code snippets

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

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

$ch = curl_init("https://api.oanor.com/viscosity-api/v1/sutherland");
curl_setopt($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/viscosity-api/v1/sutherland",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "Sutherland's law: μ(T) = μ_ref·(T/T_ref)^1.5·(T_ref+S)/(T+S). Air at 25 °C ≈ 1.84×10⁻⁵ Pa·s. Pass gas (air, nitrogen, oxygen, co2, hydrogen, helium, argon) or custom mu_ref + t_ref + s.",
        "inputs": {
            "gas": "air",
            "temperature_k": 298.15
        },
        "dynamic_viscosity_cp": 0.018371494,
        "sutherland_constants": {
            "s_k": 110.4,
            "t_ref_k": 273.15,
            "mu_ref_pa_s": 1.716e-5
        },
        "dynamic_viscosity_pa_s": 1.8371494e-5,
        "dynamic_viscosity_micropa_s": 18.371494
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:29.166Z",
        "request_id": "ff05f75a-54c6-4bca-99a3-a6b22157e5e6"
    },
    "status": "ok",
    "message": "Gas viscosity (Sutherland)",
    "success": true
}