About The Psychrometric Air Properties

The Psychrometric Air Properties tool estimates saturation vapor pressure, vapor partial pressure, humidity ratio, dew point, and moist-air enthalpy from dry-bulb temperature, relative humidity, and pressure.

How to Use the Psychrometric Air Properties Online

1. Enter the required inputs in the fields above using the units shown on the labels.
2. Select any mode, shape, or method options so the calculation matches your scenario.
3. Run the calculation and review the result summary in the output panel.
4. Check the units, assumptions, and project requirements before using the result outside preliminary review.

Choosing Options Correctly

Dry-bulb temperature is in Celsius, relative humidity is a percent from 0 to 100, and atmospheric pressure is in kPa. Results are approximate and intended for normal HVAC ranges.

Common Use Cases

• Estimate common HVAC air properties from dry-bulb and RH.
• Check dew point and humidity ratio for comfort or condensation review.
• Use quick psychrometric values before a detailed chart or model.

Quick FAQ

What air properties are estimated?
It estimates common moist-air values such as humidity ratio, dew point, enthalpy, and related psychrometric properties.

Does altitude matter?
Yes. Barometric pressure affects moist-air calculations, especially away from sea level.

Can this replace a psychrometric chart?
It is a calculator companion, but chart review is still useful for process visualization and HVAC checks.

What input pairs are valid?
Use physically consistent dry-bulb, relative humidity, wet-bulb, or dew point values as required by the tool.