Final answer:
The ambient air thermometer in a hot holding unit must be located where the temperature is closest to the actual temperature of the air in the unit. This is typically near the middle of the unit, away from any heat sources or cold spots.
Step-by-step explanation:
The ambient air thermometer in a hot holding unit must be located where the temperature is closest to the actual temperature of the air in the unit. This is typically near the middle of the unit, away from any heat sources or cold spots. Placing the thermometer in an area where there is good air circulation will also help provide an accurate reading.
For example, in a refrigerator, placing the thermometer near the top shelf or the door may not provide an accurate reading because these areas are often colder or warmer than the rest of the unit. Placing the thermometer in the middle of the refrigerator, away from any items or obstructions, will help ensure an accurate measurement of the ambient air temperature.
Similarly, in an air-conditioning unit, placing the thermometer near the air exhaust or intake may not provide an accurate reading because these areas may be warmer or cooler than the rest of the unit. Placing the thermometer in the middle of the unit, where the air is well-mixed, will provide a more accurate measurement of the ambient air temperature.