Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units

Psychrometric chart for air at barometric pressure 29.921 inches of Mercury and temperature ranging 20oF to 120oF.

The psychrometric chart below is made for standard atmospheric conditions.

  • English (Imperial) units with wet bulb and dry bulb temperature and relative humidity
  • barometric pressure 29.921 inches of Mercury
  • dry bulb temperature ranging 20oF to 120oF
  • with enthalpy units in Btu/lb

Psychrometric chart

The psychrometric chart is made with the PsycPro software available from www.linric.com.

How to Use the Psychrometric Chart

The state of air with dry bulb temperature 70 oF and relative moisture 60% can be visualized in a psychrometric chart as indicated below:

How to use a psychrometric chart

From the chart - the saturation temperature is approximately 61 oF and that the humidity ratio is approximately 66 grains of moisture per pound of dry air.

Air with saturation temperature 63 oF and dry bulb temperature 75 oF can be visualized in the psychrometric chart as

How to use a psychrometric chart

From the chart - the relative humidity is approximately 50% and the humidity ratio is approximately 66 grains* of moisture per pound of dry air.

*grains of water is commonly used in psychrometrics

  • 1 grain = 0.000143 lbm = 0.0648 g  (7000 grains per lbm)

Related Topics

  • Air Psychrometrics

    Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Air-condition systems temperatures, absolute and relative humidities and moisture content in air.

Related Documents

Search

Search is the most efficient way to navigate the Engineering ToolBox.

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

This page can be cited as

  • The Engineering ToolBox (2004). Air - Psychrometric Chart for Standard Atmospheric Conditions - Imperial Units . [online] Available at: https://www.engineeringtoolbox.com/psychrometric-chart-d_816.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter


















































12.6.9

.