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Precautions while using Laboratory Thermometers
The precautions to be observed while reading a laboratory thermometer.
1. Themometer
A thermometer is used to measure the temperature of an object. Galileo invented a rudimentary water thermometer in 1593. He called this device a thermoscope. However, this form was ineffective as water freezes at low temperatures. In 1714, Gabriel Fahrenheit invented the mercury thermometer, the modern thermometer. The long narrow uniform glass tube is called the stem of a thermometer. The scales in which the temperature is measured is marked on the scale. At the end of the stem there is a small bulb which contains mercury in it. A capillary tube is inside the glass stem in which mercury expands when the bulb is kept in contact with a hot body. Mercury is toxic, and it is very difficult to dispose it when the thermometer breaks. So, nowadays digital thermometers are used to measure the temperature, as they do not contain mercury.
2. Laboratory Thermometers
Laboratory thermometers are devices used to measure temperature. There are many types of lab thermometers such as differential, mechanical, logging, etc. Laboratory thermometers are progressively providing digital reading displays and are inputcapable to computer and software programs for logging purposes.
3. Types of Thermometers
There are different types of thermometers that measure the temperatures of different things like air, our bodies, food and many other things. There are clinical thermometers, laboratory thermometers, Galileo thermometers and digital remote thermometers. Among these, the commonly used thermometers are clinical thermometers and laboratory thermometers.
4. Clinical Thermometer
These thermometers are used to measure the temperature of the human body, at home, clinics and hospitals. All clinical thermometers have a kink that prevents the mercury from falling down rapidly so that the temperature can be noted conveniently. There are temperature scales on either side of the mercury thread, one in Celsius scale and the other in Fahrenheit scale.Since the Fahrenheit scale is more sensitive than the Celsius scale, body temperature is measured in
5. Mercury laboratory thermometers
Mercury laboratory thermometers, used in some science laboratory, requirer special safety precautions. Alcohol laboratory thermometers, despite of its less dangerous nature, should still be handled carefully to any damage. There are several principles on which empirical thermometers are built, as listed in the section of this article entitled Primary and secondary thermometers. Several such principles are essentially based on the constitutive relation between the state of a suitably selected particular material and its temperature. Only some materials are suitable for this purpose, and they may be considered as thermometric materials.


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