# types of thermometer physics

(a) What is room temperature in \(^oF\)? For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. OpenStax is part of Rice University, which is a 501(c)(3) nonprofit. The intense heat which is used to measure the temperature of our body is present under our tongue. To convert from \(^oC\) to \(^oF\), use the equation, \[T_F = \dfrac{9}{5}T_C + 32. Then our farther brings up the ultimate testing weapon, the thermometer, and all our dreams of having a rest day from school went up in smoke. Thus, the glass can break, and the mercury present inside can get in your child's body, which is poisonous. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. The SI temperature unit is the kelvin, which is abbreviated K (not accompanied by a degree sign). Below. Temperatures on these scales can be converted using the equations in Table \(\PageIndex{1}\). Relationships between the Fahrenheit, Celsius, and Kelvin temperature scales are shown. But it is the most accurate one among all the temperature measuring thermometers out there in the market. Why the thermometer is kept under the tongue? A vessel of constant volume filled with gas is subjected to temperature changes, and the measured temperature is proportional to the change in pressure. When the thermometerâs temperature increases, the liquid from the bulb is forced into the narrow tube, producing a large change in the length of the column for a small change in temperature. You need to place it inside your mouth, or you can put it in your armpit to measure the temperature. How To Measure Body Temperature By Thermometer? As will be discussed in the section on phase changes, the coexistence is achieved by lowering the pressure and consequently the boiling point to reach the freezing point. Â© 1999-2020, Rice University. Temperatures on these scales can be converted using the equations in Table 1.1. This work is licensed by OpenStax University Physics under a Creative Commons Attribution License (by 4.0). The Kelvin scale is the absolute temperature scale that is commonly used in science. Such scales are convenient in science because several physical quantities, such as the volume of an ideal gas, are directly related to absolute temperature. These are the latest thermometers that we see today, and they are pretty convenient as you don’t even have to get in contact with the patient. Thermometers measure temperature according to well-defined scales of measurement. First, it is not defined in terms of the freezing and boiling points of water, but in terms of the triple point. The Kelvin scale is part of the SI system of units, so its actual definition is more complicated than the one given above. You can see that 100 Celsius degrees span the same range as 180 Fahrenheit degrees. in addition to this, the underside of our tongue has the most blood flow and provide the most accurate measurements. Our last pick is glass and Mercury, this is the old combination, and it works like a charm, this thermometer configuration gives you the most accurate reading of the temperature. The freezing and boiling temperatures of water at standard atmospheric pressure are commonly used. You can find them in your local drug store, and they can be used both in the public and private environments. Converting between Temperature Scales - Room Temperature. Before we look at how to read a thermometer, lets first see how thermometer finds out the body temperature. covers, OpenStax CNX name, and OpenStax CNX logo are not subject to the Creative Commons license and may The freezing and boiling temperatures of water at standard atmospheric pressure are commonly used. If you are redistributing all or part of this book in a print format, The substance should have considerable variation over the small increase in temperature. Missed the LibreFest? As will be discussed in the section on phase changes, the coexistence is achieved by lowering the pressure and consequently the boiling point to reach the freezing point. Textbook content produced by OpenStax is licensed under a On the Celsius scale, the freezing point of water is 0Â°C0Â°C and the boiling point is 100Â°C.100Â°C. 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