Types Of Mercury Thermometers

1669 Words4 Pages

Types of Thermometers

1) Mercury thermometer

History:
The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam (1714).

How does it work?
The main element of a mercury thermometer is a capillary tube. The tube is sealed on both sides of the nutria and she pumped the air. At one end of the tube is a reservoir of mercury. To measure the temperature there is a special scale. Scale deposited on the bar attached to the tube. Scale measurement range from 34 to 42 degrees Celsius. To accurately measure the body temperature, each degree on the scale consists of 10 units of 0.1 degrees Celsius.

To return to the initial position of the thermometer in order to further the application and temperature measurements, it is necessary to shake the " thermometer ", thus returning the mercury back into the tank.

The benefits of a mercury thermometer:
• Medical mercury thermometer, due to its characteristics, whose performance is most accurate, and highly similar to the gas thermometer readings, which is considered the reference thermometer. Therefore mercury thermometer precisely measures the temperature thermometers rest of the human body.

• While other less mercury thermometer exposed to extraneous factors and conditions of temperature measurement.

• Construction of mercury " thermometer " allows its disinfection by full immersion in disinfectant, therefore suitable for health and medical institutions.

• Maximum thermometer primitive design provides ease of use and accessibility.

The limitations of a mercury thermometer:
• Long time measures the temperature of the body. The average temperature measurement must last at least 5-6 minutes, and for the most accurate measurement of weight req...

... middle of paper ...

...• When measuring the temperature in the armpit for the most accurate results while measuring the temperature much longer than the declared minimum. In most models, there is a strict rule in the manual " after the beep the end of the measurements should hold the thermometer still so many minutes." Therefore, the measurement of temperature is necessary to pinpoint separately, which is not very convenient.

• Most models, especially cheap household model cannot be washed and disinfected. Such a possibility is necessary to clarify the purchase, ask a sales assistant or read the operating instructions for the thermometer.

• Requires periodic replacement of batteries. While conventional batteries will last for 2-5 years, depending on frequency of use, the charge they may end up in the most inopportune moment. You should always have a spare set of batteries.

Diagram:

More about Types Of Mercury Thermometers

Open Document