The thermometer which is used in laboratory to measure the temperature of substances between the temperature -37oC. The one part of it shows maximum temperature and the other part shows minimum temperature. You can find us in almost every social media platforms. Construction: It consists of a cylindrical bulb B which is filled with mercury. So it is called maximum thermometer. 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. Besides, as the temperature of a healthy man is 98.4°F, so special bold or red mark is made on the surface of the thermometer at 98.4°F. The rising mercury level in limb B carries its index with it which attains its extreme position when the minimum temperature is reached at night. Then the bulb is heated so that mercury inside the bulb and the tube starts boiling and ejected vapor removes air from the tube. 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. A capillary tube T of uniform and a fine bore is attached to the bulb. They are available in the ear, rectal, armpit, forehead and oral models. The temperature can be read. The wall of the bulb is made thinner and the capillary tube is made narrower to make the thermometer more sensitive. Short range enables the scale to be divided into smaller intervals for bigger accurateness (0.1°C). The thermometer which is used to measure the human body temperature and as mercury as thermometric substance is called clinical thermometer. Laboratory thermometer can be used to measure both hot and cold substances. Laboratory thermometer can be used to determine both hot and cold substances. Construction: It consists of a large cylindrical bulb A connected to one end of a U-shaped glass tube BC, the other end of which is connected to a small bulb D. The large bulb A and part of the stem of the U-tube are filled with alcohol. Now the tube is kept vertically straight by a stand and a funnel F is connected by a … Hence, the clinical thermometers have the range 35˚C to 42˚C. This enables the recording of the utmost temperature of the body without the need for haste. Before using the thermometer again it should be shaken thoroughly so that mercury level goes back to the bulb. Structure: It is smaller in size than the laboratory thermometer. For measuring temperature a sensitive thermometer is needed. At night, the temperature of the air falls and the alcohol in bulb A contracts. The level of mercury tells our … A clinical thermometer has a constriction near the bulb in it. According to the construction, there are different types of the thermometers. Construction of Thermometer Firstly, a dry and clean capillary glass tube of fine and uniform bore is taken. Laboratory thermometer … 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 resetting of steel index is done to help a magnet in order to record the maximum temperature of the day. the capillary tube is filled with mercury by successive heating the cooling the bulb. The difference in temperature between these two fixed points is called the fundamental interval. 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. In this way, the bulb and the tube become filled with mercury. These are used for various purpose. 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. This kind of thermometer has both alcohol and mercury. It is smaller in size than the laboratory thermometer. All rights reserved. Usually, this thermometer is scaled by line-marks ranging from 94 to 108 degree Fahrenheit. The stem consists of a thin capillary tube at the end of which there is a bulb containing mercury. Now the tube is kept vertically straight by a stand and a funnel F is connected by a rubber tube to the open end of the capillary tube.
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