1. What is Relative Humidity from Dewpoint?

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

Purpose: It helps meteorologists, HVAC professionals, and weather enthusiasts determine the humidity level in the air.

2. How Does the Calculator Work?

The calculator uses the Magnus formula:

Where:

• \( RH \) — Relative Humidity (%)
• \( T_d \) — Dewpoint Temperature (°C)
• \( T \) — Air Temperature (°C)

Explanation: The formula calculates how close the air is to saturation by comparing the actual moisture content (represented by dewpoint) to the maximum possible moisture at the current air temperature.

3. Importance of Relative Humidity Calculation

Details: Knowing relative humidity is crucial for weather forecasting, indoor climate control, industrial processes, and human comfort assessment.

4. Using the Calculator

Tips: Enter the dewpoint temperature and air temperature in Celsius. Dewpoint cannot exceed air temperature.

5. Frequently Asked Questions (FAQ)

Q1: What is dewpoint temperature?
A: The temperature at which air becomes saturated with water vapor and dew begins to form.

Q2: Why can't dewpoint exceed air temperature?
A: Physically impossible - air can't hold more moisture than its saturation point at the current temperature.

Q3: What does 100% RH mean?
A: The air is fully saturated with water vapor - any additional moisture will condense.

Q4: How accurate is this formula?
A: The Magnus formula is accurate to within about ±0.4°C for temperatures between -40°C and 50°C.

Q5: What's a comfortable RH range for humans?
A: Typically 30-60% - lower can cause dryness, higher can feel muggy and promote mold growth.