The vertical axis on the right-hand side. What it is: The actual mass of water vapor per unit mass of dry air. Usually measured in grains of moisture per pound of dry air (gr/lb) or grams per kilogram. How to read: Find the number on the right. Follow the horizontal line to the left. This tells you exactly how much water is physically in the air.
These are horizontal lines with values on the right-side vertical axis. It measures the weight of water vapor per pound of dry air. how do you read a psychrometric chart
Since humans feel comfort based on a mix of temperature and humidity, the chart helps designers find the "sweet spot" for indoor environments. The vertical axis on the right-hand side
Reading this chart allows you to diagnose comfort problems. If a room feels "clammy," looking at the chart might tell you that the air is at 75°F but the Dew Point is too high, meaning surfaces are likely getting wet. It transforms air from an abstract concept into a calculable physical substance. How to read: Find the number on the right
To read the chart, you must recognize the different types of lines and what they represent.
Here is the step-by-step guide to decoding the psychrometric chart.