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The dew point is the temperature to which air must be cooled for water vapour to condense. Unlike relative humidity, dew point is an absolute moisture measure that stays constant when temperature changes.

الصيغة

Dew Point = (b × alpha) / (a − alpha)

دليل خطوة بخطوة

  1. 1Uses the Magnus formula: alpha = ln(RH/100) + (a × T)/(b + T)
  2. 2Constants: a = 17.625, b = 243.04 degrees C
  3. 3Dew Point = (b × alpha) / (a − alpha)
  4. 4Dew point above 21°C feels humid; above 24°C feels oppressive

أمثلة محلولة

الإدخال
Temperature 25°C, Humidity 60%
النتيجة
Dew point ~16.7°C — Comfortable
الإدخال
Temperature 30°C, Humidity 80%
النتيجة
Dew point ~26.2°C — Oppressive
الإدخال
Temperature 10°C, Humidity 40%
النتيجة
Dew point ~-3.5°C — Very Dry

أسئلة شائعة

What is Dew Point?

The dew point is the temperature to which air must be cooled for water vapour to condense. Unlike relative humidity, dew point is an absolute moisture measure that stays constant when temperature changes

How accurate is the Dew Point calculator?

The calculator uses the standard published formula for dew point. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Dew Point calculator use?

This calculator works with inches, Celsius. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Dew Point calculator use?

The core formula is: Uses the Magnus formula: alpha = ln(RH/100) + (a × T)/(b + T). Each step in the calculation is shown so you can verify the result manually.

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