Question

Which of the following is not true about the laboratory thermometers?
A. Laboratory thermometers are used to measure temperatures with a high degree of precision.
B. Laboratory thermometers are used to measure body temperature.
C. Range of the laboratory thermometer is $- 10{\rm{C}}$ to $110{\rm{C}}$.
D. Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, etc.

Answer 1

Laboratory thermometers are used to carry out the basic operations in labs such as to find out the temperatures of various substances like boiling point, freezing point, wet bulb temperature, etc.

Complete answer:
-Laboratory thermometers are the typical thermometers in the shape of a long stem with a bulb at one of the ends of the stem. The bulb of the thermometer which carries the mercury has to be partially or fully immersed into the liquid whose temperature is to be evaluated. If the fluid whose temperature is to be calculated is hot then the volume of mercury will increase as a result of which reading of the thermometer increases and gives us the information of the temperature at that particular instant. When fluid to be measured is cold, then mercury will contract its volume resulting in lower reading of the temperature at that instant.
-Typical thermometers to measure the temperature of the human body are replaced by the digital ones. Also in order to measure the temperature of a body using a laboratory thermometer then the bulb has to be immersed into the mouth and while taking out the bulb out the reading will decrease due to ambient temperature as a result of which inaccurate results will be obtained.

Therefore, on the basis of the above explanation it can be said that the option (B) is not true about laboratory thermometers.

Note: Do not resemble the laboratory thermometers with the typical mercury thermometers which were used to measure temperature of the human body before digital thermometers.