Temperature Humidity Dew Point Calculator

Dew Point Formula:

\[ T_d = \frac{b \times (\ln(\frac{RH}{100}) + \frac{a \times T}{b + T})}{a - \ln(\frac{RH}{100}) - \frac{a \times T}{b + T}} \]

Temperature (T):

°C

Relative Humidity (RH):

Constant (a):

Constant (b):

°C

Dew Point (T_d):

Definition: This calculator estimates the dew point temperature based on air temperature and relative humidity using the Magnus formula.

Purpose: It helps determine when water vapor will condense, which is important for weather forecasting, HVAC systems, and industrial processes.

The calculator uses the Magnus formula:

\[ T_d = \frac{b \times (\ln(\frac{RH}{100}) + \frac{a \times T}{b + T})}{a - \ln(\frac{RH}{100}) - \frac{a \times T}{b + T}} \]

Where:

Explanation: The formula approximates the relationship between temperature, humidity, and the condensation point of water vapor.

Details: Knowing the dew point helps predict fog, frost, or condensation formation, and is crucial for comfort assessment and material storage.

Tips: Enter the air temperature in °C, relative humidity (0-100%), and constants a (default 17.27) and b (default 237.7 °C).

Q1: What is dew point temperature?
A: The temperature at which air becomes saturated with water vapor and dew forms.

Q2: Why are constants a and b needed?
A: These are empirical constants that make the Magnus formula accurate for typical atmospheric conditions.

Q3: What's a comfortable dew point range?
A: Below 16°C is comfortable, 16-18°C is somewhat humid, above 18°C is uncomfortable.

Q4: How does dew point differ from humidity?
A: Dew point is an absolute measure of moisture, while relative humidity depends on temperature.

Q5: When would dew point equal temperature?
A: When relative humidity is 100% (air is saturated).