Here are two advantages of a thermocouple thermometer over a liquid-in-glass thermometer:
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Wider Temperature Range: Thermocouple thermometers can measure a much wider range of temperatures compared to liquid-in-glass thermometers. While liquid-in-glass thermometers typically have limitations based on the liquid used (e.g., mercury or alcohol), thermocouples can operate at extremely high temperatures, making them suitable for industrial applications and extreme environments.
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Faster Response Time: Thermocouple thermometers generally provide faster response times than liquid-in-glass thermometers. The small size and construction of thermocouples allow them to quickly reach thermal equilibrium with the measured environment, resulting in more immediate readings. This is especially beneficial in dynamic processes where temperature changes rapidly.