Red spirit-filled thermometers provide increased safety and economic pricing. They contain a petroleum-based column with red dye, which is significantly safer than mercury. These thermometers all have 6 to 7mm outer diameters, and the bulbs have equal or smaller diameters than the stems.
Features
- Full immersion thermometers need to be submerged deep enough so the desired temperature is at the meniscus
- For example, if you wish to measure the temperature of a hot water bath to make sure it is 100degC
- Partial immersion thermometers are useful if you have a shallow container which holds the substance to be measured
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