What is the difference between total and partial immersion thermometers?
Total immersion thermometers are designed to indicate temperatures correctly when just that portion of the thermometer containing the liquid is exposed to the temperature being measured. For example, if a bath temperature is 50°C, the thermometer would need to be immersed to the 50°C line, and then pulled out approximately 3/4″ to attach a scope or to read by eye. Partial Immersion thermometers are designed to indicate temperatures correctly when the bulb and a specified part of the stem (for example 76 mm) are exposed to the temperatures being measured. Be aware that total immersion thermometers are generally more accurate than partial immersion thermometers of similar range and design. Partial immersion thermometers will show variances in temperature due to emergent stem temperature differences. Therefore, whenever possible, one should choose a total immersion thermometer. If the bath is too shallow or total immersion is otherwise impractical, emergent stem temperature corrections sh
A. Total immersion thermometers are designed to be inserted into the entire measurable portion of the material or solution where it is not affected by external forces. These may require more space to obtain readings, however they are generally more accurate. Partial immersion thermometers are designed for areas that have limited space, including small samples, laboratory ovens and shallow baths. Since only a small portion of the thermometer is immersed and the remainder of it is subject to outside temperature factors, the scales are graduated to indicate temperatures at specific depths.
