construction of clinical thermometer
It is a long narrow glass tube with a bulb containing mercury at the end. What do you mean by Sensitivity of a Thermometer? The normal human body temperature is 37˚C; which can fluctuate between the ranges 35˚C to 42˚C. to 357oC. A capillary tube T of uniform and a fine bore is attached to the bulb. During cooling the volume of the rest air inside the bulb and the tube decreases, so some mercury enters inside the tube due to outside pressure. Just above the bulb at … Due to this, mercury thread does not fall on removing the bulb from the mouth of the patient. How many kinds of fixed points in thermometer scale? For measuring temperature of human body this thermometer is extensively used. Some of the types are discussed below: A thermometer used to determine the temperature of the human body. Construction: It consists of a cylindrical bulb B which is filled with mercury. But since the mercury level above C cannot come back to the bulb through the fine capillary tube, it remains above C. So the upper level of the mercury surface indicates the temperature of the body. In Celsius degree, thermometers have markings from 350 C to 42 0 C. The normal temperature of a healthy person in degree Celsius is 370 C. Write short note on laboratory thermometer. The wall of the bulb is made thinner and the capillary tube is made narrower to make the thermometer more sensitive. Stay connected with Kullabs. Even after the thermometer removed from the body. It has a bulb of very thin glass attached with a capillary of a very fine bore. The bulb is long and thin instead of spherical. This range is centered on the normal body temperature of 36.9°C. In mercury thermometer, the, The difference in temperature between these two fixed points is called the, Depending on the temperature scale, the fundamental interval is equally divided into some divisions and each division is called. In Celsius degree, thermometers have markings from 350 C to 42 0 C. The normal temperature of a healthy person in degree Celsius is 370 C. This thermometer is used to measure the maximum and minimum temperature of a particular place within 24 hours. The thermometer which is used in laboratory to measure the temperature of substances between the temperature -37oC. In Fahrenheit, the thermometer has the markings from 94° f to 108° F. The standard temperature of a fit person is 98.6° F, which is indicated by a red arrow on the scale. Usually, laboratory thermometer is made in Celsius scale which has the scale from -100 C to 1100 C. Write short note on clinical thermometer. Then we monitor the number against the point at which the mercury line stop growing further indicates the body temperature of the person. When the mercury returns to the normal state, two marks are made on the tube corresponding to the temperatures of the two fixed points. The bend of the U-tube contains a thread of mercury. This contraction causes mercury to rise in limb C. The index in limb C does not fall with mercury, it remains to stick to the wall at its maximum thermometer height. The wall of the bulb is made thinner and the capillary tube is made narrower to make the thermometer more sensitive. Working: When the temperature of the surrounding air rises, the alcohol in bulb A expands, pushing the mercury down the limb C. Along with it, the index in limb C is pushed up to the extreme position reached. Clinical thermometers are meant for clinical purposes. In this way, the bulb and the tube become filled with mercury. Working Principle: The thermometer is thoroughly shaken before measuring the temperature of the body. The humble house brick might be the battery of the future? A clinical thermometer has a constriction near the bulb in it. Two scales are provided to measure maximum and minimum thermometer. Firstly, a dry and clean capillary glass tube of fine and uniform bore is taken. All rights reserved. A medical thermometer has a constraint close to the bulb in it. The volume of air inside the bulb and the tube expands due to heat and some air comes out through the mercury as bubbles. The volume of air inside the bulb and the tube expands due to heat and some air comes out through the mercury as bubbles. To determine the temperature a person has to hold the tip of the thermometer either under the armpit or in the mouth under his tongue for a minute. For this reason this thermometer is called clinical thermometer or doctor’s thermometer. Just above the bulb at point C, the tube is made narrow and bent. This helps the mercury in the bulb to obtain the patient’s temperature more rapidly and exactly.
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