.. _auto_math_mass_ideal_gas:

*COMPUTES THE MASS BASED ON IDEAL GAS LAW*
==========================================

Computes the mass of an ideal gas mixture (80% N₂ / 20% O₂ by mole fraction) using the ideal gas law: mass = (P·V / T·R) × (0.8·M_N₂ + 0.2·M_O₂). Use this worker when you need to derive gas mass from thermodynamic state variables in airbag, pneumatic, or thermodynamic system workflows.

When to use
-----------

Classification: **process**.

Tagged: ``N2``, ``O2``, ``airbag``, ``gas_mass``, ``ideal_gas_law``, ``molar_weight``, ``scalar``, ``thermodynamics``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Pressure
     - pressure
     - scalar
     - —
     - ✓
     - Absolute gas pressure (Pa or consistent pressure units); multiplied with volume in the ideal gas law numerator.
   * - Volume
     - volume
     - float
     - 1
     - ✓
     - Gas volume (m³ or consistent volume units); default 1.0 — override with the actual chamber or bag volume.
   * - Temperature
     - temperature
     - float
     - 1
     - ✓
     - Absolute gas temperature in Kelvin; default 1.0 — must be set to a physically meaningful value (e.g. 293.15 K) for correct results.
   * - Gas Constant
     - gasconstant
     - float
     - 1
     - ✓
     - Specific or universal gas constant in units consistent with P, V, and T (e.g. 8.314 J/(mol·K) for universal); default 1.0 — set to the appropriate value for the chosen unit system.
   * - N2 Molar Weight
     - n2molarweight
     - float
     - 1.0
     - ✓
     - Molar mass of nitrogen N₂ (kg/mol); default 1.0 — set to 0.028014 kg/mol for standard air calculations.
   * - O2 Molar Weight
     - o2molarweight
     - float
     - 1.0
     - ✓
     - Molar mass of oxygen O₂ (kg/mol); default 1.0 — set to 0.032000 kg/mol for standard air calculations.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - math_mass_ideal_gas_output_1
     - math_mass_ideal_gas_output_1
     - scalar
     - Computed gas mass (kg or units consistent with inputs) calculated as (P·V / T·R) × (0.8·M_N₂ + 0.2·M_O₂), representing an 80/20 N₂/O₂ air mixture.

Disciplines
-----------

- data.curve.transform
- engineering.cfd

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=math_mass_ideal_gas <https://www.d3view.com/api/workflow/example?id=math_mass_ideal_gas>`_

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>math_mass_ideal_gas</code>. Schema hash: <code>3a4b5daf5116</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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