During temperature measurement, what should be ensured about the measuring device's position?

The correct choice emphasizes the importance of stability and full submersion of the measuring device in the medium being measured. This ensures that the device can accurately capture the temperature without interference or error caused by external influences such as air currents or surface anomalies. A stable and fully submerged device allows for consistent readings, as it directly interacts with the entire volume of the material, leading to a representative temperature measurement.

In temperature measurement, accuracy is paramount, and anything less than full submersion could lead to significant inaccuracies, as the temperature at the surface may differ from that within the material. Stability also prevents fluctuations in readings, allowing for a reliable assessment of the temperature over time.