Dalton partial pressures API

Applies Dalton's law to split a total pressure into component partial pressures from mole fractions or moles (auto-normalised), with optional labels. Answers 'What is the partial pressure of O2 in air?', 'partial pressures of a 1:3 gas mix at 1 atm'.

Price$0.04per request

MethodPOST

Route/v1/chemistry/partial-pressure

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

chemistrypartial-pressuredaltongas-mixturemole-fractiongas-lawpressurethermodynamics

API URLhttps://x402.hexl.dev/v1/chemistry/partial-pressure

Integration docs

Example request

{
  "totalPressure": 1,
  "moles": [
    1,
    3
  ],
  "labels": [
    "N2",
    "O2"
  ]
}

Example response

{
  "totalPressure": 1,
  "components": [
    {
      "label": "N2",
      "moleFraction": 0.25,
      "partialPressure": 0.25
    },
    {
      "label": "O2",
      "moleFraction": 0.75,
      "partialPressure": 0.75
    }
  ],
  "formula": "P_i = x_i · P_total"
}

Input schema

{
  "type": "object",
  "required": [
    "totalPressure"
  ],
  "properties": {
    "totalPressure": {
      "type": "number",
      "examples": [
        1
      ]
    },
    "moleFractions": {
      "type": "array",
      "items": {
        "type": "number"
      }
    },
    "moles": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "examples": [
        [
          1,
          3
        ]
      ]
    },
    "labels": {
      "type": "array",
      "items": {
        "type": "string"
      }
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}