Students need to learn about various instruments used in science. When they will understand the working and structure of scientific instruments they will develop an interest in science. Students should know about some of the basic scientific instruments like a clinical thermometer. A clinical thermometer is a thermometer used to measure the temperature of the human body. Most of these thermometers are mercury thermometers. They are very precise and sensitive, there is a narrow place where mercury levels rise very quickly. A bend in the tube prevents the mercury level from dropping on its own. Most display both Celsius and Fahrenheit temperature scales, and range from 35 degrees Celsius to 42 degrees Celsius. They are cleaned before and after each use, with alcohol. Thermometers work on the principle that solids and liquids expand as they heat up. As the temperature rises, the mercury expands causing it to move upwards and represent the temperature. Scientifically the maximal thermometer implies the maximum temperature attained even after removal from the body. As the bulb’s temperature grows, the liquid expands in the duct through the compression or fold that deters the mercury from falling back. A conventional thermometer is a glass tube with a bulb at one end including a liquid that develops evenly with temperature. The tube itself is thin (capillary tube) and has characteristic markings along the tube. The liquid is usually mercury, but alcohol thermometers utilize tinted alcohol. Hope that all the students must have understood about the clinical thermometer.
Explore the resources centered around CBSE Physics, ICSE, and other boards. Click here to know more.