Absolute Humidity Calculator

Calculate the absolute humidity (water vapor content) in the air based on temperature and relative humidity.

Input Parameters

Calculation Results

Calculation Results

Absolute Humidity: -- g/m³

Saturation Vapor Pressure: -- hPa

Actual Vapor Pressure: -- hPa

Calculation Formula

Absolute Humidity (g/m³) = 621.97 × (Actual Vapor Pressure / (621.97 + Actual Vapor Pressure)) × 273.15 / (273.15 + Temperature)

Where:
- Actual Vapor Pressure = Saturation Vapor Pressure × Relative Humidity / 100
- Saturation Vapor Pressure is calculated using the Antione equation

Absolute Humidity Calculator Usage Guide

Learn how to use the Absolute Humidity Calculator and understand the principles behind it.

What is Absolute Humidity?

Absolute humidity refers to the actual amount of water vapor present in a given volume of air, typically measured in grams per cubic meter (g/m³). Unlike relative humidity, which is a ratio comparing the current amount of water vapor to the maximum possible at a given temperature, absolute humidity provides a direct measure of water vapor content.

How to Use This Calculator

  1. Enter the temperature of the air in degrees Celsius (°C).
  2. Enter the relative humidity of the air as a percentage (%). Make sure it's between 0% and 100%.
  3. Click the "Calculate" button to compute the absolute humidity.

Understanding the Results

  • Absolute Humidity: The actual amount of water vapor in the air (g/m³).
  • Saturation Vapor Pressure: The maximum amount of water vapor the air could hold at the given temperature (hPa).
  • Actual Vapor Pressure: The current pressure exerted by the water vapor in the air (hPa).

Principle of Calculation

This calculator uses the Antoine equation to calculate the saturation vapor pressure of water at the given temperature, then uses it to determine the actual vapor pressure based on the relative humidity. Finally, it calculates the absolute humidity using the following formula:

Absolute Humidity (g/m³) = 621.97 × (Actual Vapor Pressure / (621.97 + Actual Vapor Pressure)) × 273.15 / (273.15 + Temperature)

Practical Applications

Absolute humidity is an important parameter in meteorology, HVAC systems, and environmental monitoring. It helps in understanding weather conditions, designing climate control systems, and studying humidity-related environmental phenomena.