{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.3/division-3.3.2/division-3.3.2.4",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.3/division-3.3.2/division-3.3.2.4.json",
  "legislation": "eur/2017/654",
  "legislation_title": "Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-654",
  "path": "annex/VII/division/3/division/3.3/division/3.3.2/division/3.3.2.4",
  "kind": "division",
  "number": "3.3.2.4",
  "heading": "Dew point determination from relative humidity and dry bulb temperature",
  "text": "If humidity is measured as a relative humidity, RH %, the dew point, T dew, shall be determined from RH % and dry bulb temperature by means of equation (7-81):\nT dew = 2,0798233 × 10 2 − 2,0156028 × 10 1 × ln p H2O + 4,6778925 × 10 – 1 × ln p H2O 2 − 9,2288067 × 10 – 6 × ln p H2O 3 1 − 1,3319669 × 10 – 1 × ln p H2O + 5,6577518 × 10 – 3 × ln p 2 H2O − 7,517286510 × 10 – 5 ln p 3 H2O (7-81)\nWhere\np H2O water vapor pressure scaled to the relative humidity at the location of relative humidity measurement, T sat = T amb\nT dew dew point as determined from relative humidity and dry bulb temperature measurements",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.3/division/3.3.2/division/3.3.2.4",
    "retrieved_at": "2026-11-01T14:45:01.864924+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}