1. What is Absolute Humidity?

Definition: Absolute humidity is the measure of water vapor in the air, regardless of temperature, expressed as grams of water vapor per cubic meter of air (g/m³).

Purpose: This calculator determines the actual amount of water vapor present in the air based on dew point and ambient temperature.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( AH \) — Absolute humidity (g/m³)
• \( T_d \) — Dew point temperature (°C)
• \( T \) — Ambient temperature (°C)
• \( e \) — Exponential function

Explanation: The formula calculates saturation vapor pressure from dew point, then converts it to absolute humidity using the ideal gas law.

3. Importance of Absolute Humidity

Details: Absolute humidity is crucial for HVAC design, industrial processes, meteorology, and understanding human comfort levels.

4. Using the Calculator

Tips: Enter the dew point temperature and ambient temperature in Celsius. Dew point cannot exceed ambient temperature.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between absolute and relative humidity?
A: Absolute humidity measures actual water vapor content, while relative humidity is the percentage of vapor relative to maximum capacity at that temperature.

Q2: Why does dew point matter for absolute humidity?
A: Dew point is the temperature at which air becomes saturated, directly relating to the actual water vapor content.

Q3: What's a typical absolute humidity range?
A: Comfortable indoor air is typically 5-12 g/m³. Below 5 is dry, above 12 feels humid.

Q4: How does temperature affect the calculation?
A: Temperature appears in the denominator to convert vapor pressure to density (g/m³).

Q5: What if my dew point equals ambient temperature?
A: This means 100% relative humidity (air is saturated) and the highest possible absolute humidity for that temperature.