🔍 Key Concepts

• Use the dry bulb temperature (horizontal axis at the bottom) to find the correct vertical reference line • Use the wet bulb temperature (slanted lines labeled in degrees F) to find where it crosses the dry bulb line • From that intersection, follow the nearest relative humidity curve (smooth curved lines labeled 10%, 20%, 30%, etc.)

💭 Think About

• What is the temperature difference between the dry bulb (58°F) and wet bulb (44°F), and does that indicate relatively dry or moist air? • After marking 58°F on the bottom axis, which wet‑bulb line for 44°F passes through that region of the chart? • Once you locate the intersection of 58°F dry bulb and 44°F wet bulb, which labeled humidity curve does that point lie on or closest to?

✅ Before You Answer

• Confirm you are reading 58°F on the bottom horizontal axis (dry bulb) and not confusing it with dew point on the right side • Verify that you are following the 44°F wet bulb line, not a nearby 45°F or 40°F line • Double‑check which humidity curve label (10%, 20%, 30%, etc.) passes exactly through or closest to your intersection point before choosing among 25%, 28%, 30%, and 58%