Advertisements
Advertisements
प्रश्न
Describe a clinical thermometer. How does it differ from the thermometer used in laboratory?
Advertisements
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
A clinical thermometer is not used to measure the temperature of air, why?
What is the use of kink in clinical thermometer?
Why do we jerk a clinical thermometer before we measure the body temperature?
Draw the diagram of a clinical thermometer and label its parts.
State the similarities and differences between the laboratory thermometer and the clinical thermometer
The thermometer which ranger from -10°C to 110°C is ______.
All clinical thermometers have a ______ that prevents mercury from flowing back into the bulb.
What is the boiling point of mercury?
A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in the following figure.
Which of the thermometers, A or B, will show a greater rise in temperature? Give reason for your answer.
In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?
