Question

The topmost curve in the psychrometric chart represents the saturation line with  relative humidity.

• A. 100
• B. 75
• C. 50
• D. 0

Hint:

On a standard psychrometric chart, the main boundary curve on the top and left is always the 100% relative humidity line, also known as the saturation line.

Answer 1

The Correct Option is A

Step 1: Describe a psychrometric chart. It is a graph that plots the thermodynamic properties of moist air. The horizontal axis is the dry-bulb temperature, and the vertical axis is the humidity ratio (or specific humidity).

Step 2: Identify the main curves on the chart. The chart contains various lines representing properties like wet-bulb temperature, specific volume, and relative humidity.

Step 3: Locate the saturation line. The prominent curved line that forms the upper-left boundary of the chart is the saturation curve. Along this entire line, the air is saturated with water vapor. By definition, saturated air has a relative humidity of 100%. Therefore, this curve represents 100% relative humidity.