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प्रश्न
Describe a clinical thermometer. How does it differ from the thermometer used in laboratory?
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उत्तर
A clinical thermometer has a narrow stem and a long bulb filled with mercury (or alcohol). There is a small constriction in the stem above the bulb. When the bulb of the thermometer is held in the armpit or the mouth of a patient, the mercury (or alcohol) in the bulb rises in the stem.
When it is taken out of the patient’s body, the small constriction does not allow the mercury (or alcohol) from the stem to retreat into the bulb. Thus, this arrangement enables us to read the temperature of the patient’s body at ease after the removal of the thermometer from his body
The figure shows a clinical thermometer. It has a slight bend or kink in the stem just above the bulb, this kink is called the constriction which prevents the mercury from falling back all by itself. As the body temperature of a healthy person is 37°C, clinical thermometers are designed to measure temperatures between 35°C and 42°C.
Clinical thermometer
संबंधित प्रश्न
Match the following
| i. | Clinical thermometer | A form of energy |
| ii. | Normal temperature of human body | 100°C |
| iii. | Heat | 37°C |
| iv. | Boiling point of water | 0°C |
| v. | Melting point of water | Kink |
A clinical thermometer indicates temperatures from a minimum of ______ °F to a ______ maximum of °F.
Before use, the mercury level in clinical thermometer should be below ______.
Mercury is a poor conductor of heat.
What is the boiling point of mercury?
Mention the use of laboratory thermometers.
Mention any two precautions to be followed while using a clinical thermometer.
Write a note on the laboratory thermometer.
Explain how do you determine the temperature of hot water using a laboratory thermometer?
Four arrangements to measure temperature of ice in beaker with laboratory thermometer are shown in the following figure (a, b, c and d). Which one of them shows the correct arrangement for accurate measurement of temperature?
