The glass is then sealed off, resulting in a vacuum when the mercury contracts during cooling. Initially the color is dark red, but as the temperature increases the color changes first to yellow and then to nearly white—at 2,400° F (1,300° C). Temperature definition is - degree of hotness or coldness measured on a definite scale. A thermometer is an instrument we can use to measure temperature. I needed this information for my project and this is one of the best website I could find. The glass tube of a thermometer usually contains mercury. They utilize various oxides of nickel, manganese, or cobalt and work best in the temperature range of about –60° to 300° F (–50° to 150° C). Among babies, children, and adults, the following thermometer readings are generally a … Please note: Text within images is not translated, some features may not work properly after translation, and the translation may not accurately convey the intended meaning. An analog thermometer consists of a sealed tube with markings on it. Britannica does not review the converted text. Thermometer, instrument for measuring the temperature of a system. They can take readings of body temperature by measuring heat coming from the ear. The invention of the thermometer is attributed to Galileo. Instead of that we can learn more about science. Take a minute to check out all the enhancements! As the temperature of … You should keep it up forever! Thus a small amount of expansion or contraction of the mercury in the bulb, caused by heating or cooling, produces a noticeable rise or fall in its level in the tube. A thermometer is an instrument for measuring or showing temperature (how hot or cold something is). Temperature measurement is important to a wide range of activities, including manufacturing, scientific research, and medical practice. The unit of measurement for temperature is a degree , and the two temperature … A higher-than-normal thermometer reading can be a sign of a fever. The first sealed thermometer was produced by the German physicist Daniel Gabriel Fahrenheit in 1714. These markings are increasing temperatures in Celsius or Fahrenheit. Search the Kids Internet . noun an instrument for measuring temperature, often a sealed glass tube that contains a column of liquid, as mercury, that expands and contracts, or rises and falls, with temperature changes, the temperature being read where the top of the column coincides with a … A thermometer has two important elements: (1) a temperature sensor (e.g. Temperature is measured by an instrument called a thermometer. For very high or very low temperatures, as well as for very accurate measurements, liquid-in-glass thermometers are not suitable. This is a good website for children. Your normal body temperature would be 98.6 °F on the Fahrenheit scale. Accessible across all of today's devices: phones, tablets, and desktops. Get weekly videos, articles, play ideas and mocomi updates in your inbox, Physics | 8-12 yrs | Interactive, Learning Pod. We hope you and your family enjoy the NEW Britannica Kids. He also proposed the first widely used temperature scale, which bears his name. A standard thermometer, like the one here, is a tube that's filled with a liquid, such as mercury. Login or Register above to download the content. If steel and brass strips are fastened on top of each other and then heated, for instance, the combined strip will bend. A thermometer is a device that is used to measure temperature, which is how hot or cold something is. In making a liquid thermometer, the mercury is ordinarily driven to the top of the tube by heating. Kids.Net.Au - Dictionary > Definition: thermometer . Thermometers take advantage of a scientific property called thermal expansion. Such devices are sometimes used as thermostats, or temperature controllers, in such places as automobile water-cooling systems. Can you explain why there is such a big difference? Human body temperature is measured with the clinical, or fever, thermometer. The tube’s thick, curved face acts as a magnifier that makes the thin thread of mercury clearly visible. A new, third level of content, designed specially to meet the advanced needs of the sophisticated scholar. Want to be notified when our magazine is published? It is a specialized type of liquid-in-glass thermometer, and it is unusual in that it measures temperature only within a very limited range, usually within about 10° F (5.5° C). As I web-site possessor I believe the content matter here is rattling wonderful , appreciate it for your hard work. Medical Definition of thermometer : an instrument for determining temperature that usually consists either of a device providing a digital readout or of a glass bulb attached to a fine tube of glass with a numbered scale and containing a liquid (as mercury or colored alcohol) that is sealed in and rises and falls with changes of temperature Ltd. All Rights Reserved. For high-temperature applications the tube is filled with a pressurized gas before sealing to prevent the mercury from boiling. Good Luck. thermometer synonyms, thermometer pronunciation, thermometer translation, English dictionary definition of thermometer. ProjectAsk your parent to allow you to use the house thermometer. It contains tools for weather education, including weather games, activities, experiments, photos, a glossary and educational teaching materials for the classroom. Another type is a digital thermometer, which uses electronics to measure temperature. An optical pyrometer uses a lightbulb-type filament controlled by a rheostat, or dimmer switch, which is calibrated so that the colors of the filament correspond to the surface temperatures. It takes only 30 seconds for a digital thermometer to give you a reading because the heat-sensitive tip is able to accurately tell the computer chip inside what the temperature is. The measure of this current is an indication of the temperature of the element. Record the temperature of your body after a cold shower and after a bit of exercise. thermometer definition: 1. a device used for measuring temperature, especially of the air or in a person's body 2. a device…. After translating an article, all tools except font up/font down will be disabled. The same safe and trusted content for explorers of all ages. One type of thermometer is a narrow, concealed glass tube containing mercury or alcohol which extends along the tube as it expands. Mercury is perfect to test temperature because it changes from a solid to liquid very easily.
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