Types of Thermometer
Types of Thermometer
Thermometer:
Thermometer is a device which is used to measure temperature. Thermometer is made of a long narrow glass tube; with a bulb at one end. The narrow tube appears as a continuous silver line; because it is filled with mercury. Mercury is a metal which is in liquid state at room temperature and it readily expands or contracts at the slightest change in temperature. Hence, mercury is used in thermometer.
Types of Thermometer:
A. Laboratory Thermometer: Laboratory thermometer is used to measure the temperature. The scale of temperature is graduated generally from –10°C to 110°C over the glass tube. Each division of temperature scale is further divided into 10 parts to read fraction of temperature.
B. Clinical Thermometer: Clinical thermometer is used to measure the body temperature. The scale of temperature is graduated from 35°C to 42°C and or from 94°F to 108°F. The temperature of human body always remains within this range and this is the range on the clinical thermometer. There is a kink make near the bulb of clinical thermometer which prevents the automatic fall of mercury level.
C. Digital Thermometer: In digital thermometer, reading of temperature is displayed digitally as in digital watches. This is safer because no mercury is used in this. It is important to note that mercury is a highly toxic substance.
Which of the following are correct ? (a) In a laboratory thermometer there is the narrow tube that appears as a broken silver line; because it is filled with mercury . (b) The mercury is used in thermometer. (c) Clinical thermometer is used to measure the body temperature.
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| Right Option : B | |||
| View Explanation | |||
The normal temperature of human body is : | |||
| Right Option : B | |||
| View Explanation | |||
For a clinical thermometer we use a solid and a liquid. The liquid use in a clinical thermometer is : | |||
| Right Option : A | |||
| View Explanation | |||
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