What is the first step in the calibration of a thermometer?

The first step in the calibration of a thermometer involves preparing a standard reference point, which is often obtained using ice. Filling a container with ice, specifically crushed ice mixed with a small amount of water, creates a stable temperature environment at 32°F (0°C). This ice bath provides a reliable baseline measurement necessary to accurately check and adjust the thermometer's readings.

Using ice is essential because it ensures that the thermometer is exposed to a fixed temperature, allowing for precise calibrations. Once the thermometer is placed in the ice bath and has stabilized, it can be compared to the known temperature of the ice, allowing any discrepancies to be addressed. This step is critical in ensuring that the thermometer provides accurate and reliable temperature readings in various applications, particularly in food safety and health inspections.