API · /gaslaw-api

Ideal Gas Law API

healthy 4,439 Subscribers

Ideal-gas-law maths as an API, computed locally and deterministically. The ideal endpoint solves PV = nRT for whichever quantity you leave out: provide any three of pressure, volume, amount of substance (moles) and temperature, and it returns the fourth in several units. The combined endpoint applies the combined gas law, P₁V₁/T₁ = P₂V₂/T₂: give a first state and two quantities of the second state and it finds the missing one — handy for "what happens to the volume if I double the pressure" questions. The density endpoint computes the density of an ideal gas from the pressure, temperature and molar mass (ρ = P·M / R·T). Pressure accepts pascals, kPa, bar, atm, psi, mmHg and Torr; volume accepts m³, litres, mL and cubic feet; temperature accepts kelvin, Celsius and Fahrenheit; and the gas constant R is 8.314462618 J/(mol·K). Everything is computed in SI internally and is instant and private. Ideal for chemistry and physics education, lab and process tools, HVAC and scuba calculations, and engineering software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is ideal-gas thermodynamics; for the chemical elements and periodic-table data use an elements API.

#gas-law #ideal-gas #thermodynamics #chemistry #physics #developer-tools

api.oanor.com/gaslaw-api

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Machine-readable spec so AI agents can integrate this API.

/api/gaslaw-api/openapi.json

/api/gaslaw-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 94 ms; Server probes · 24h
Subscribers: 4,439; active
Total calls: 36; last 7 days

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Pricing

Pick a tier — billed monthly, cancel anytime.

Free

12,535 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
12,535 calls/month
2 req/sec
Ideal + combined + density
No credit card

Starter

€14.05 /month

22,150 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
22.15k calls/month
8 req/sec
Pa/atm/bar/psi, K/C/F
Email support

Pro

€33.95 /month

271,500 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
271.5k calls/month
20 req/sec
Lab / engineering pipelines
Priority support

Mega

€71.95 /month

1,400,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
1.4M calls/month
50 req/sec
Platform scale
Dedicated SLA

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Vapor Pressure API

Vapor-pressure thermodynamics as an API, computed locally and deterministically. The clausius-clapeyron endpoint predicts the vapor pressure of a substance at a new temperature from a known reference point and the molar enthalpy of vaporization, using ln(P2/P1) = -ΔHvap/R·(1/T2 - 1/T1) with temperatures in kelvin — so from water boiling at 101.325 kPa at 373.15 K and ΔHvap ≈ 40.66 kJ/mol it returns about 42.6 kPa at 350 K. The enthalpy endpoint inverts the same relation: given two pressure/temperature points it solves for the molar enthalpy of vaporization, ΔHvap = -R·ln(P2/P1)/(1/T2 - 1/T1), in J/mol and kJ/mol. The antoine endpoint evaluates the Antoine equation log10(P) = A - B/(C + T) both ways — supply a temperature to get the vapor pressure, or a pressure to get the boiling temperature — defaulting to the water constants (°C and mmHg, so water reads 760 mmHg at 100 °C) but accepting any A, B, C for other substances. The gas constant R = 8.314462618 J/(mol·K). Everything is computed locally and deterministically, so it is instant and private. Ideal for chemical-engineering, process-simulation, distillation, HVAC, meteorology and chemistry-education app developers, boiling-point and phase-equilibrium tools, and lab software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is vapor pressure and boiling point; for humidity and dew point use a psychrometric API and for ideal-gas state use a gas-law API.

api.oanor.com/vaporpressure-api

Carnot Heat Engine API

Heat-engine efficiency and coefficient of performance as an API, computed locally and deterministically. The efficiency endpoint gives the Carnot maximum efficiency of any heat engine working between two temperatures, η = 1 − Tc/Th (in kelvin) — the absolute upper limit no real engine can beat — and, given a heat input, the maximum work it could produce and the heat it must reject. The heat-pump endpoint gives the Carnot coefficient of performance of a heat pump, COP = Th/(Th − Tc), and of a refrigerator or air conditioner, COP = Tc/(Th − Tc), and the heat moved for a given work input. The engine endpoint analyses a real engine from its heat balance: from any two of the heat input, the work output, the efficiency or the heat rejected it returns the rest using η = W/Qh and Qc = Qh − W, and — given the reservoir temperatures — compares it to the Carnot limit and reports the second-law (exergy) efficiency. Temperatures accept kelvin, Celsius or Fahrenheit. Everything is computed locally and deterministically, so it is instant and private. Ideal for thermodynamics-education tools, engine, turbine and HVAC design, refrigeration and heat-pump apps, and energy-systems software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is heat-engine and refrigeration-cycle efficiency; for sensible heat use a specific-heat API and for heat-exchanger LMTD use a heat-exchanger API.

api.oanor.com/carnot-api

Newton Cooling & Convection API

Newton's law of cooling and convective heat transfer as an API, computed locally and deterministically. The convection endpoint applies the convective-heat-transfer rate Q = h·A·ΔT — the heat carried away from a surface equals the convection coefficient times the area times the temperature difference between the surface and the fluid — and solves for whichever of the heat rate, the coefficient, the area or the temperature difference you leave out, with typical coefficients for natural and forced air, water, boiling and condensing built in. The cooling endpoint applies Newton's law of cooling, T(t) = T_env + (T0 − T_env)·e^(−k·t): from an initial temperature, the ambient temperature and a cooling constant (or time constant τ = 1/k) it gives the temperature after a time, or the time to reach a target temperature, or it solves the cooling constant from a measured temperature at a known time — the maths behind how a hot drink, a forensic body or a cooling casting approaches room temperature. The coefficient endpoint links the cooling constant to the physical properties, k = h·A/(m·c), and the thermal time constant. Everything is computed locally and deterministically, so it is instant and private. Ideal for thermal-engineering and HVAC tools, food-safety and forensic cooling apps, electronics-cooling and process-control software, and physics education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is convection and transient cooling; for steady conduction through walls use a U-value API and for thermal radiation use a Stefan-Boltzmann API.

api.oanor.com/cooling-api

Heat Exchanger LMTD API

Heat-exchanger LMTD and effectiveness-NTU maths as an API, computed locally and deterministically. The lmtd endpoint computes the log mean temperature difference, LMTD = (ΔT1 − ΔT2)/ln(ΔT1/ΔT2), the true average driving temperature of a heat exchanger, from the hot and cold stream inlet and outlet temperatures for either a counterflow or a parallel-flow arrangement, and flags a temperature cross. The duty endpoint applies Q = U·A·LMTD·F — the heat duty equals the overall heat-transfer coefficient times the area times the LMTD times an optional correction factor — and solves for whichever of the duty, the coefficient, the area or the LMTD you leave out, taking the LMTD directly or from the four temperatures. The effectiveness endpoint uses the effectiveness-NTU method: from the hot and cold heat-capacity rates (given directly or as mass flow times specific heat) and the number of transfer units NTU = U·A/Cmin, it returns the capacity ratio, the effectiveness for the arrangement, and — given the inlet temperatures — the maximum and actual heat duty and the outlet temperatures. Everything is computed locally and deterministically, so it is instant and private. Ideal for process, chemical and mechanical engineering tools, HVAC, refrigeration and thermal-design apps, and engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is two-stream heat-exchanger analysis; for the sensible heat of a single stream Q = m·c·ΔT use a specific-heat API.

api.oanor.com/lmtd-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Ideal Gas Law API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Ideal Gas Law API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Ideal Gas Law API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Ideal Gas Law API cost?

Ideal Gas Law API has a free tier with 100 calls / month. Paid plans start at €14.05 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Ideal Gas Law API GDPR-compliant?

All requests to Ideal Gas Law API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Gas 3

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/combined

Combined gas law

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GET /v1/density

Ideal-gas density

Playground

Parameters

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GET /v1/ideal

Solve PV = nRT

Playground

Parameters

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GET /v1/meta

Spec

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Code snippets

curl https://api.oanor.com/gaslaw-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/gaslaw-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/gaslaw-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/gaslaw-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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Ideal Gas Law API

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Related APIs

Vapor Pressure API

Carnot Heat Engine API

Newton Cooling & Convection API

Heat Exchanger LMTD API

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