1. What is Dew Point?

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

Purpose: Knowing the dew point helps predict fog, frost, and condensation, and is important in meteorology, HVAC, and industrial processes.

2. How Does the Calculator Work?

The calculator uses the Magnus formula:

Where:

• \( T_d \) — Dew point temperature (°C)
• \( T \) — Air temperature (°C)
• \( RH \) — Relative humidity (%)
• \( a \) — Constant (17.27)
• \( b \) — Constant (237.7)

Explanation: The formula approximates the relationship between temperature, humidity, and dew point based on the Clausius-Clapeyron relation.

3. Importance of Dew Point Calculation

Details: Dew point helps determine:

• Comfort levels in buildings
• Risk of mold growth
• Potential for aircraft icing
• Industrial process control

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What does a high dew point indicate?
A: High dew points (>18°C) indicate muggy conditions, while low dew points indicate dry air.

Q2: Can dew point be higher than temperature?
A: No, dew point cannot exceed the current air temperature (RH would be >100%).

Q3: How accurate is this formula?
A: The Magnus formula is accurate to within ±0.4°C for temperatures between -40°C and 50°C.

Q4: What's the difference between dew point and wet bulb temperature?
A: Wet bulb temperature is always between dew point and dry bulb temperature, affected by evaporation cooling.

Q5: Why does dew point matter in construction?
A: It helps determine when surfaces might become wet, affecting painting, concrete curing, and material storage.