{ "version": "1.0.0", "kind": "calculated, not measured", "owner": "https://inzonex.co.uk/calc/dew-point/", "model": "PsychroLib 2.5.0", "upstream_commit": "fca789d70d61aa4a4b5b6594d3e7299a7f4c86db", "input_domain": { "air_c": [ -40, 60 ], "rh_pct": [ 1, 100 ], "surface_c": [ -80, 80 ] }, "grid": { "air_step_c": 5, "rh_step_pct": 5, "rows": 420, "surface": "not entered" }, "phase": "RH and saturation inversion use ice at or below 0.01 C, liquid water above.", "fields": { "air_c": "Dry-bulb temperature, Celsius", "rh_pct": "Relative humidity percentage on rh_reference basis", "surface_c": "Optional surface temperature, Celsius; null in reference grid", "rh_reference": "water or ice at air temperature", "saturation_point_c": "Dew point over water or frost point over ice, Celsius", "phase": "Phase of returned saturation point", "surface_margin_c": "surface_c minus saturation_point_c; null without surface", "vapor_pressure_pa": "Calculated partial water-vapour pressure, pascals" }, "sources": [ "https://psychrometrics.github.io/psychrolib/api_docs.html", "https://github.com/psychrometrics/psychrolib/tree/fca789d70d61aa4a4b5b6594d3e7299a7f4c86db", "https://www.vaisala.com/en/application-note/how-choose-right-instrument-measuring-humidity-your-application" ], "reuse": "Original Inzonex calculated grid and chart: CC BY 4.0. PsychroLib code: separate MIT licence; ASHRAE attribution retained. No manufacturer or ASHRAE handbook tables republished.", "limits": [ "Not a moisture-duration, mould or insulation design model.", "Cold-air RH over water cannot be entered as RH over ice.", "No independent instrument validation or field measurements." ], "records": [ { "air_c": -40, "rh_pct": 5, "surface_c": null, "rh_reference": "ice", "saturation_point_c": -63.78570953662424, "phase": "ice", "surface_margin_c": null, "vapor_pressure_pa": 0.6422624652052812 }, { "air_c": -40, "rh_pct": 10, "surface_c": null, "rh_reference": "ice", "saturation_point_c": -58.72175121459956, "phase": "ice", "surface_margin_c": null, "vapor_pressure_pa": 1.2845249304105624 }, { "air_c": -40, "rh_pct": 15, "surface_c": null, "rh_reference": "ice", "saturation_point_c": -55.645166047224826, "phase": "ice", "surface_margin_c": null, "vapor_pressure_pa": 1.9267873956158434 }, { "air_c": -40, "rh_pct": 20, "surface_c": null, "rh_reference": "ice", "saturation_point_c": -53.40854288053116, "phase": "ice", 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