I-Calculator ye-Dew Point
Thola indawo yokugcoba kusuka ku-air temperature ne-relative humidity, nge-comfort rating.
Iziphetho zivuselelwa uma ubhala.
Malunga nale khadi
The dew point is the temperature to which air must be cooled for its water vapour to start condensing into dew, and it is the most honest single measure of how much moisture the air actually holds. A higher dew point means more water in the air and a muggier, stickier feel; it is also the temperature at which fog forms, grass gets damp overnight and a cold drink beads with condensation. This dew point calculator derives it from the air temperature and the relative humidity you enter.
It uses the Magnus-Tetens approximation with the Alduchov-Eskridge coefficients (a = 17.625, b = 243.04 °C): first γ = ln(RH / 100) + aT / (b + T), then the dew point = bγ / (a − γ), with T in °C. As a worked example, air at 25 °C and 60% relative humidity has a dew point of about 16.7 °C — comfortable edging toward sticky. Drop the humidity to 30% at the same 25 °C and the dew point falls to roughly 6 °C, distinctly dry. The method is accurate to within a few tenths of a degree across ordinary weather, and the tool works in either °C or °F.
Dew point predicts comfort far better than relative humidity, because relative humidity depends on temperature: 90% humidity on a cold morning feels dry, while 60% on a hot afternoon feels oppressive. As an absolute measure, dew point cuts through that — below about 13 °C (55 °F) feels comfortable, 16–18 °C (60–65 °F) starts to feel sticky, and above 21 °C (70 °F) is oppressive and hard to cool down in. The same value tells you when condensation will form on windows, pipes and aircraft surfaces.
Imibuzo ebuzwa kaningi
Yini ifomula esetshenziswa kulapho ukoma khona?
I-Magnus-Tetens efinyelela nge-Alduchov-Eskridge eqhubekayo: γ = ln(RH/100) + 17.625·T/(243.04+T), nendawo yokugcoba = 243.04·γ/(17.625−γ), ne-T e °C. Ilungile ngaphakathi kwezinga elincane lezinga elingaphezu kwezimo zezulu ezijwayelekile.
Kungani i-dew point ibaluleke kakhulu kune-humidity?
Ukushisa okufanayo kuxhomekeke kukushisa, ngakho-ke ukushisa okungu-90% ku-10 °C kubukeka kupholile kanti ukushisa okungu-60% ku-30 °C kubukeka kubanda. Izinga lokushisa liyisilinganiso esiphelele sokushisa, ngakho-ke lilandelela ukuthi umoya ubukeka kanjani uqinile.
Yini indawo yokugcoba ebukeka ikhululekile?
Izinga lokushisa elingaphansi kuka-13 °C (55 °F) libukeka likhululekile futhi lipholile, 16-18 °C (60-65 °F) liqala ukubonakala liqinile, futhi ngaphezu kuka-21 °C (70 °F) linzima futhi linzima ukupholisa.
Ingabe indawo yokugcoba ingaphakeme kunamazinga okushisa omoya?
Akunalutho. Kuningi kakhulu, indawo yokugcoba ilingana nezinga lokushisa lezulu, elikwenzeka ku-100% lokushisa okuhlobene lapho umoya ugcwele. Noma yikuphi ukupholisa nokugcoba kucindezela, ngakho indawo yokugcoba ihlala noma ngaphansi kwezinga lokushisa lamanje.
Ingabe i-moist point ihlobene kanjani ne-fog ne-moist formation?
Uma i-surface noma i-air ipholile kuze kube yilapho i-moist point ikhona, i-vapor i-condenses - lokho ukuthi lapho i-moist point ihlala khona emlonyeni, i-fog i-forms kanye ne-condensation beads ku-cold glass. I-moist point ephakathi kwe-night low iyiphawu elingcono loku-moist noma i-moist point ikhona.
Ingabe indawo yokugcoba ishintsha uma izinga lokushisa lishintsha?
Ayikho ngempela - i-dew point ibonisa i-moisture content ekhona, ehlala ikhona njengoba umoya upholile noma upholile. Okushintshayo ngokushisa yi-relative humidity, ngakho-ke i-dew point iyisilinganiso esiqinile somoya obandayo.
Ingabe i-formula ka-Magnus-Tetens esetshenziswa yilokhu ilungile?
Ngezinkomba ze-Alduchov-Eskridge, kulungile ukuba kuhlolwe ngaphakathi kwezinga le-Celsius ezingu-10 ezincane eziphakathi kokulinganisa okujwayelekile kwezinga lokushisa nokushisa kokushisa, okulungile ngaphakathi kokucaciswa kokufunda kokushisa kokushisa kosuku ngalunye.
API — sebenzisa le calculator kusuka kukhodi
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Ingxenye yendawo
GET https://calculator.free/api/v1/dew-point/curl
curl "https://calculator.free/api/v1/dew-point/?units=c&temp=25&humidity=60"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/dew-point/?" + new URLSearchParams({
"units": "c",
"temp": "25",
"humidity": "60"
}));
const data = await r.json();
console.log(data.results);Izibalo ziyisilinganiso esisetshenziswa ukuqondisa kuphela, hhayi ukucebisa ngezimali, ukwelashwa noma ukukhokha.