A medical thermometer has a constraint close to the bulb in it. Due to the thin bore of the tube, a little change in the volume of the mercury becomes considerably noticeable. For measuring temperature of human body this thermometer is extensively used. One end of it is connected to a cylindrical bulb B and the other end is closed. You can find us in almost every social media platforms. In this way, the bulb and the tube become filled with mercury. A clinical thermometer is a tool for measuring body temperature. Due to this, mercury thread does not fall on removing the bulb from the mouth of the patient. In this condition, if the thermometer is placed under the tongue or under the arms, the temperature and consequently the volume of the thermometer increases. When the thermometer is taken out of the body, the mercury level contracts. This enables the recording of the utmost temperature of the body without the need for haste. The difference in temperature between these two fixed points is called the fundamental interval. At night, the temperature of the air falls and the alcohol in bulb A contracts. 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. What do you mean by Sensitivity of a Thermometer? A capillary tube T of uniform and a fine bore is attached to the bulb. It is developed for measuring the human body temperature. The bulb is long and thin instead of spherical. 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. The clinical thermometer consists of a glass stem on which readings are marked. Mercury thermometer expands and contracts according to the rise or fall in temperature. Laboratory thermometer consists of a bulb with a long capillary tube. Construction: It consists of a cylindrical bulb B which is filled with mercury. The resetting of steel index is done to help a magnet in order to record the maximum temperature of the day. The wall of the bulb is made thinner and the capillary tube is made narrower to make the thermometer more sensitive. Then we monitor the number against the point at which the mercury line stop growing further indicates the body temperature of the person. Now the tube is kept vertically straight by a stand and a funnel F is connected by a … Maximum and minimum thermometer  is used to measure the maximum and minimum temperature of a particular place within 24 hours. © copyright 2020 QS Study. The scale on the thermometer is markrd from 95 F to 110 F (35 C to 43 C).The normal body temperature is shown by a red arrow at 98.4 F (or 37 C). The bulb D is partly filled with alcohol, with some place left at the top to allow for the expansion of alcohol. For measuring temperature a sensitive thermometer is needed. According to the construction, there are different types of the thermometers. Laboratory thermometer … For this reason, this thermometer is called clinical thermometer or doctor’s thermometer. All rights reserved. Le physicien suédois Anders Celsius fit construire en 1741 un thermomètre à mercure, gradué de sorte que 100 ° correspondît au point de congélation de l'eau, et 0 ° à son point d'ébullition, qui fut utilisé de 1742 à 1750 à l’observatoire d’Uppsala [3]. 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. It includes every relationship which established among the people. In this way, the bulb and the tube become filled with mercury. Just above the bulb at … Explain Effect of Pressure on Boiling Point, Explain Relation among Celsius, Fahrenheit and Kelvin scale, WSU Scientists develop software to identify drug-resistant bacteria, Technologist research on Software of autonomous driving systems, Demonstration of Pressure Sensing Hand Gesture Recognition, The discovery of black nitrogen solves a chronic chemical anomaly. So it is called maximum thermometer. According to the construction, there are dissimilar types of thermometers. When the mercury returns to the normal state, two marks are made on the tube corresponding to the temperatures of the two fixed points. Due to this, mercury thread does not fall on removing the bulb from the mouth of the patient. 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. Depending on the temperature scale, the fundamental interval is equally divided into some divisions and each division is called degree. Explain Effect of Pressure on Boiling Point, WSU Scientists develop software to identify drug-resistant bacteria, Technologist research on Software of autonomous driving systems, Demonstration of Pressure Sensing Hand Gesture Recognition, The discovery of black nitrogen solves a chronic chemical anomaly. Some of the types are discussed below: A thermometer used to measure the temperature of human body. A capillary tube T of uniform and fine bore is attached to the bulb. A capillary tube arises from this bulb. In Fahrenheit, the thermometer has the markings from 940 f to 1080 F. The normal temperature of a healthy person is 98.60 F, which is indicated by a red arrow on the scale. In this condition, the tube is sealed by a sharp and pointed flame. The thermometer which is used to measure the temperature of a human body and has mercury as the thermometric substance is called clinical thermometer. There can be more than one community in a society. Clinical thermometers are meant for clinical purposes. Consequently, the mercury above level C goes back to the bulb. Sign up and receive the latest tips via email. As a result, some mercury flows through the capillary tube C from the bulb B. A capillary tube T of uniform and a fine bore is attached to the bulb. Then the bulb is heated so that mercury inside the bulb and the tube starts boiling and ejected vapor removes air from the tube. Thermometers consist of three basic elements: spirit-filled liquid, which response to changes in heat and cold; a glass tube to house the temperature-measuring liquid; and black ink to color in the engraved scale marks with readable numbers. When the bulb is cooled to room temperature, the bulb and a part of the capillary tube become filled with mercury and the rest of the capillary tube remains empty. Occupation, Business & Technology Education, Mechanical Advantage, Velocity Ratio and Efficiency, Types of Thermometer According to Construction, House Wiring System and Some Electrical Devices, Valency, Molecular Formula and Chemical Reaction, Electronic Configuration and Atomic Structure, Sodium Carbonate, Sodium Bicarbonate and Glycerol, Function, Dispersion and Germination of Seed, Interrelationship Between Cell, Tissue and Organs in Human Body, Environmental Degradation and its Conservation, Preventive Measure of Landslide and Flood, Agencies Involved in Environmental Conservation, Fire and Epidemics Minimization and Management. In mercury thermometer, the lower fixed point is marked corresponding to the melting point of ice and the upper fixed point is marked corresponding to the boiling point of water. It is specially designed to measure the human body temperature. Usually, laboratory thermometer is made in Celsius scale which has scaled from -100 C to 1100 C. Thermometer which is used to measure the maximum and minimum temperaature of a particular place within 24 hrs is called maximum and minimum thermometer. Laboratory thermometer can be used to measure both hot and cold substances. 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.

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