🔍 Key Concepts

• Relative humidity definition and how it is measured in air conditioned or accommodation spaces • Difference between temperature/heat content charts and air moisture/comfort charts • Where HVAC (heating, ventilation, and air conditioning) engineers plot dry-bulb temperature, wet-bulb temperature, and relative humidity

💭 Think About

• Which chart is specifically designed to show the relationship between air temperature, moisture content, and relative humidity? • On which of these charts would you expect to plot dry-bulb and wet-bulb thermometer readings to get relative humidity? • Which of these chart types is most commonly used in HVAC work for human comfort in living spaces rather than for pure thermodynamic analysis?

✅ Before You Answer

• Identify which option is most closely associated with HVAC and air-conditioning design rather than general thermodynamics. • Confirm which chart includes lines of constant relative humidity. • Eliminate choices that mainly deal with energy/heat content of steam or working fluids instead of room air conditions.