Definition check in psychrometry The temperature indicated by a thermometer not affected by air moisture content is called:

Introduction / Context:
Psychrometric properties are essential in HVAC design and analysis. Distinguishing between dry-bulb, wet-bulb, and dew-point temperatures is fundamental for chart reading and load calculations.

Given Data / Assumptions:

• Standard atmospheric air mixture with water vapour.
• Thermometer measuring in free air without a wetted wick.

Concept / Approach:
Dry-bulb temperature (T_db) is the ordinary air temperature measured by a standard thermometer shielded from radiation and without evaporative effects. Wet-bulb temperature uses a wetted wick and airflow to register evaporative cooling. Dew-point temperature is the saturation temperature corresponding to the partial pressure of water vapour.

Step-by-Step Solution:
Identify measurement without moisture effects → dry-bulb.Recognize that wet-bulb requires a wetted wick and airflow.Dew-point is not directly measured by a dry thermometer; it is inferred from moisture content.

Verification / Alternative check:
On the psychrometric chart, dry-bulb is the horizontal axis, reaffirming its role as the basic temperature measure independent of immediate moisture interaction at the sensor.

Why Other Options Are Wrong:
Wet-bulb explicitly depends on evaporation; dew-point is a moisture property; adiabatic saturation temperature is a process temperature found by a specific apparatus.

Common Pitfalls:
Exposing dry-bulb thermometers to radiation or poor shielding leads to biased readings; ensure proper shielding and airflow.

Final Answer:
Dry-bulb temperature