Optical sensors have been used to build contactless thermometers that are able to detect infrared radiation emitted by hot objects. When there is a change in temperature the strip beds or unwinds which causes the pointer attached to the end of the strip to move which indicates the temperature. The normal ear temperature is 99.5 degrees F (37.5 degrees C) in adults. 1. Therefore, the body temperature cannot be measured by touching the eardrum. These kinds of thermometers are used in the clinics by the doctors, so they are also called a doctor’s thermometers. Thermometers design to measure temperatures in industrial and home systems. Don't hesitate! Many, if not all, of us have used thermometers in one way or another, be it to determine the weather outside or to measure the temperature of the body. These are advanced thermometers used to measure the temperature of a body of a high level of accuracy. Alcohol thermometers have ethanol or toluene instead of mercury in the glass tube. A temporal artery thermometer may be more expensive than other types of thermometers. mercury thermometer. The advantage of this kind of thermometer is the short time it takes to get a reading and the availability of places where measurements are made. Here is a brief explanation of the different types of thermometers available, and information on which thermometer types are most accurate. However, there can be up to a 30 percent error reading due to this lack of contact, but this can be corrected with a traceable accuracy setting. thank you so much for appreciating us, we are trying our best to add content regularly to the website is still under processing. The latter is more commonly used. Necessary cookies are absolutely essential for the website to function properly. Last Updated 26 November, 2020. Types of Thermometers. It should have a small specific heat capacity. Thermal Expansion: Formula, examples and applications. Bimetal means that it is made of two metals. The permissible error of temperature measurement with the use of a re-usable multi-phase thermometer is + 0.1 ° C and -0.2 ° C. Phase-to-phase reactive thermometers and most disposable phase thermometers are designed to measure the temperature in the armpit and in the mouth. An ideal thermometer shall have an infinite temperature range. External and internal factors can also affect the readings so consider taking at least three readings. Calibrate your instrument before use and follow proper guidelines to get accurate readings. Electronic touch thermometer. Resistance thermometers are designed to measure temperatures between -250 and 700 degrees Celsius by noting the resistance change of a liquid by a currant flowing through the platinum wire inside. For example, if you measure the temperature of the air outside, you will know how to dress appropriately. It is however considered one of the most accurate method to find the body’s temperature. hoping for some new information regarding heat capacity in detail.thnks alot for granting us this kind of ultimate facts. The color of these thermometer strips can be matched to a chart, which gives the corresponding temperature of food. Most of these types of thermometers are also less accurate than other types of touch devices. We hope you are enjoying ScienceStruck! These thermometers give the reading in Celsius as well as Fahrenheit. In this post, we will tell you about the most common types of thermometers. These devices are also used in science and production to measure the temperatures of different metals, liquids, gases and other materials. However, we want to talk a little bit more about clinical thermometers, as they are probably the most common ones that everyone has to deal with. Infrared thermometers capture body heat in the form of infrared energy given off by a heat source. Using this kind of thermometer, we can measure the temperature on the forehead, under the armpit or in the mouth. Direct sunlight, cold temperatures or a sweaty forehead can affect temperature readings. When the bulb contacts a hot object, the liquid in it expands and rises in the tube. This type is also known as a pressure-filled or vapour-pressure thermometer. 2. Some substances have the property that changes with temperature. Although temperature strips are not thermometers per se, they are often used in hospitals as a way of quickly determining a patient’s temperature. Forehead strips Mercury thermometers have mercury filled in a glass tube and has a glass bulb at the bottom. Beurer, Fig. All of the ones we have mentioned above require contact to determine temperature. Some thermometers belonging to this category are used in the first wave to measure the temperature of the forehead. Image: pexels.com, pixabay.com, unsplash.com, pikist.com (modified by author)Source: Original. You can find more informations here: Cookie Policy. A suitable liquid is filled in the bulb. The mercury-in-glass or the mercury thermometer designed by physicist Daniel Gabriel Fahrenheit in Amsterdam (1714). Infrared ear thermometers measure the thermal radiation emitted by the eardrum. An inner ear thermometer is a digital thermometer where a probe is inserted into the ear to check temperature. plz add some more pics otherwise this is more informative than others!!! We also use third-party cookies that help us analyze and understand how you use this website. You can also get spring based weather thermometers which shows the temperature according to the expansion and contraction of the heat sensitive spring. To allow for an accurate temperature reading and to prevent the contact of a thermally sensitive substance with the surroundings, the cavities in this type of thermometer are covered with a transparent polymer. It determines the temperature based on the change of pressure in a gas or liquid. Bimetallic thermometers are perfect for higher temperatures as they become less sensitive and accurate at lower temperatures. No contact is required which makes this a popular type of thermometer when more than one person needs a temperature check as there is no need to clean the device between uses. Mercury is used mostly in thermometers because of the following properties: “Im obliged for the article.Really thank you! Rectal thermometer also works on the principal of other oral thermometers. A bimetal thermometer has a strip usually in the form of spiral rod. It is used to measure the room temperature of hot solids and liquids in experiments. Your email address will not be published. Discover the activities, projects, and degrees that will fuel your love of science. Digital thermometers are quickly replacing all of the old liquid-in-glass types. Here we shall look into the different types of thermometers available, which not only give accurate readings but are also very easy to use. Beurer, read about fever, what it is and how to measure it, https://infekcje.mp.pl/publikacje/122369,rodzaje-termometrow-lekarskich-i-ich-cechy, https://medyczny-rzeszow.pl/_blog/10-Rodzaje_termometrow_medycznych_i_ich_zastosowanie.html, https://zdrowybajtel.pl/termometr-pomiar-temperatury/, Preparation for laboratory tests (blood and urine) in 10 steps, Glucometers and measurement of glycemic level, Interna Szczeklika 2018 Internal Diseases Handbook, Authors: Piotr Gajewski, Andrzej Szczeklik Publisher: Medycyna Praktyczna. where: It measures temperature in the range 500 k to 2300 k. These measures the temperature from the heat radiation emitted by the objects. Traditional thermometers are designed for at home use for measuring the temperature of the air or water in both F or C. These should not require much maintenance, but they may have a varied accuracy, range and resolution. Some people call them ‘temperature guns’ as most are handheld and look like miniature guns. Digital instant thermometersThese thermometers read the temperature within 10 seconds but cannot be kept in the food while cooking. Today, there are different kinds of thermometers which are more accurate in terms of temperature measurement and are very easy to use. It has a very high boiling point (357 °C). I'm singing in the rain, just singing in the rain; What a wonderful…, If you want to know the way in which the velocity of wind is measured throughout the world, read this article, which describes anemometers and the way they work, along…. Among listed types of thermometers, these are a very common type of industrial thermometer that are used to keep the temperature of stored gas constant within a confined area. This will help to ensure that the results you get are credible so that you can trust the information you are using to make decisions. This type works best with very low temperatures. Some thermometers have the measuring scales for both Celsius and Fahrenheit. When paired with a temperature scale, it is possible to use this occurrence to determine the temperature. Here is how to use thermometers: These devices are used wherever there is a need to measure temperature, for example: These are not the only places where these devices come in handy. These thermometers are usually filled with mercury and the recorded temperature can be seen as the rise/drop of the mercury level in the bulb.