Know your data sources.

Fluid phase behavior and gas quality for natural gas, condensate and oil compositions: TP flash, dew and bubble points, phase envelope, ISO 6976 heating value. Computed in-process with a TypeScript port of Equinor's open-source NeqSim library (SRK or Peng-Robinson cubic equation of state, NeqSim component data and binary interaction parameters); no external service, no setup. Give the composition as mole fractions of named components (methane through nC10, nitrogen, CO2, H2S, water, oxygen, argon, helium, hydrogen), temperature in C/F/K and absolute pressure in bara/psia.