Ikhalenda Yendawo engatshintshiyo
Fumana indawo yotywala ukusuka kwiqondo lobushushu lomoya kunye nobushushu obuhambelanayo, ngomgangatho wokuhlala kakuhle.
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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 ebuza rhoqo
Yintoni ifomula esetyenziswa kwincopho ye-moisi?
I-Magnus-Tetens ejikelezayo nge-Alduchov-Eskridge ehlala njalo: γ = ln(RH/100) + 17.625·T/(243.04+T), kunye nendawo yothuli = 243.04·γ/(17.625−γ), nge-T kwi °C. Ichanekile ngaphakathi kweeshumi eziliqela zeqondo ngaphezulu kwemeko yemozulu eqhelekileyo.
Kutheni inqanaba le-molly libalulekile ngakumbi kune-humidity?
Ubushushu obuhambelanayo buxhomekeke kubushushu, ngoko ke i-90% yobushushu kwi-10 °C iziva ishushu ngelixa i-60% kwi-30 °C iziva ishushu. Inqanaba lokutyhala liyimfuneko yovavanyo lobushushu, ngoko ke ilandelela ukuba ubushushu buziva buqinile kangakanani umoya.
Yintoni inqanaba le-moisi eziva likhululekile?
Ngaphantsi kwe-13 °C (55 °F) uziva ukhululekile kwaye ushushu, 16-18 °C (60-65 °F) uqala uziva utyheli, kwaye ngaphezulu kwe-21 °C (70 °F) uxinzelelo olukhulu kwaye kunzima ukufudumeza.
Ingaba indawo yothuli iya kuba phezulu kunamanzi ashushu?
Hayi. Kuninzi kakhulu indawo yotywala ilingana neqondo lobushushu lomoya, esenza kwi-100% yotywala olufanayo xa umoya ugcwele. Nayiphi na i-cooler kunye nomphunga utywala, ngoko indawo yotywala iya kuhlala iphantsi okanye ngaphantsi kobushushu obukhoyo.
Inqaku le-moth liqhagamshelana njani nothuli kunye nokwenziwa kwemoth?
Xa i-ubuso okanye umoya upholile ukuya kwincopho yotywala, umphunga utyhala - oko kukuthi xa utywala luhlala kwi-grass, i-foam ivela kwaye i-foam i-perles kwiglasi eshushu. I-foam point efutshane ne-night low yiphawu olulungileyo lotywala okanye utywala luya kubakho.
Ingaba indawo yomoya itshintsha xa ubushushu butshintsha?
Ayiyiyo ngokwayo - inqanaba lothuli libonisa umxholo osebenzayo wothuli, ohlala ekhona njengoko umoya ushushu okanye upholile. Okutshintshayo ngobushushu kukufuma okufanayo, oko kubangela ukuba inqanaba lothuli lilinganiso oluzinzileyo lomoya obandayo.
Ichanekile kangakanani ifomula kaMagnus-Tetens esetyenziswa yinkqubo?
Nge-Alduchov-Eskridge i-coefficients ichanekile ngaphakathi kweshumi elincinci leqondo leCelsius kwinqanaba eliqhelekileyo lobushushu bemozulu kunye nobushushu obumanzi, oluya kufumaneka kakuhle ngaphakathi kwe-precision yemihla ngemihla yokufunda kobushushu obumanzi.
API — sebenzisa le calculator ukusuka kwikhowudi
Nceda le khadi lemali njengendawo esemva ye-JSON ekhululekileyo - akukho qhosha lifunekayo. Thumela amaxabiso endawo ezantsi njengeparameter yombuzo okanye i-JSON. Nantoni na oyenzayo isebenzisa okungagqibekanga okufanayo eli phepha ligqityiwe ngaphambili; iparameter engaziwayo yi 400, ayikho i zero ekhululekileyo. Funda i-API epheleleyo →
Incopho yesiphelo
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);Results are estimates for general guidance only, not financial, medical or tax advice.