Dew Point Temperature Calculator by Magnus Formula

Magnus Formula for Dew Point:

\[ T_d = \frac{b \times \alpha(T,RH)}{a - \alpha(T,RH)} \]

where \(\alpha(T,RH) = \frac{a \times T}{b + T} + \ln(RH)\)

Dew Point Temperature:

°C

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1. What is Dew Point Temperature?

Definition: The dew point temperature is the temperature at which air becomes saturated with water vapor and dew begins to form.

Purpose: It's used in meteorology, HVAC systems, industrial processes, and to assess comfort levels in buildings.

2. How Does the Calculator Work?

The calculator uses the Magnus formula:

\[ T_d = \frac{b \times \alpha(T,RH)}{a - \alpha(T,RH)} \]

where \(\alpha(T,RH) = \frac{a \times T}{b + T} + \ln(RH)\)

Where:

\( T_d \) — Dew point temperature (°C)
\( T \) — Air temperature (°C)
\( RH \) — Relative humidity (%)
\( a, b \) — Magnus formula constants (17.27 and 237.7)

Explanation: The formula approximates the relationship between temperature, humidity, and dew point based on empirical data.

3. Importance of Dew Point Calculation

Details: Knowing the dew point helps prevent condensation problems, predict fog formation, and determine optimal conditions for various industrial processes.

4. Using the Calculator

Tips: Enter the current air temperature in °C and relative humidity in percentage (0-100%). The calculator will determine the dew point temperature.

5. Frequently Asked Questions (FAQ)

Q1: What does dew point indicate?
A: It indicates the temperature at which moisture will condense out of the air at the current humidity level.

Q2: Why is dew point important in weather forecasting?
A: It helps predict fog, frost, and precipitation, and indicates air mass characteristics.

Q3: What's considered a comfortable dew point?
A: Generally, below 16°C (60°F) is comfortable, while above 21°C (70°F) feels oppressive.

Q4: How accurate is the Magnus formula?
A: It's accurate to within ±0.4°C for temperatures between -40°C and 50°C.

Q5: What happens when temperature reaches dew point?
A: Relative humidity reaches 100% and condensation occurs (dew, fog, or precipitation forms).