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单词 thermometer
释义

thermometer


ther·mom·e·ter

T0158500 (thər-mŏm′ĭ-tər)n. An instrument for measuring temperature, especially one having a graduated glass tube with a bulb containing a liquid, typically mercury or colored alcohol, that expands and rises in the tube as the temperature increases.

thermometer

(θəˈmɒmɪtə) nan instrument used to measure temperature, esp one in which a thin column of liquid, such as mercury, expands and contracts within a graduated sealed tube. See also clinical thermometer, gas thermometer, resistance thermometer, thermocouple, pyrometer

ther•mom•e•ter

(θərˈmɒm ɪ tər)

n. an instrument for measuring temperature, often a sealed glass tube containing a column of liquid, as mercury, that expands and contracts with temperature changes, the temperature being read where the top of the column coincides with a calibrated scale on the tube or frame. [1615–25] ther•mo•met•ric (ˌθɜr məˈmɛ trɪk) ther`mo•met′ri•cal, adj.

ther·mom·e·ter

(thər-mŏm′ĭ-tər) An instrument used to measure temperature. There are many types of thermometers, each of which makes use of a physical effect of temperature to indicate the temperature of the medium being measured. The most common thermometer consists of a closed, graduated glass tube in which a liquid expands or contracts as the temperature increases or decreases. Other types of thermometers work by detecting changes in the volume of an enclosed gas or by registering changes in the electrical resistance of a conducting material at different temperatures.

thermometer

an instrument for measuring temperature.See also: Instruments
Thesaurus
Noun1.thermometer - measuring instrument for measuring temperaturethermometer - measuring instrument for measuring temperaturealcohol thermometer, alcohol-in-glass thermometer - thermometer consisting of a glass capillary tube marked with degrees Celsius or Fahrenheit and containing alcohol which rises or falls as it expands or contracts with changes in temperaturecandy thermometer - a thermometer used to determine the temperature of candy syrups during cookingcapillary, capillary tube, capillary tubing - a tube of small internal diameter; holds liquid by capillary actionCentigrade thermometer - a thermometer calibrated in degrees centigradecryometer - a thermometer designed to measure low temperaturesdry-bulb thermometer - an ordinary thermometer with a dry bulb; used to measure the air temperatureFahrenheit thermometer - a thermometer calibrated in degrees Fahrenheitair thermometer, gas thermometer - thermometer that measures temperature by changes in the pressure of a gas kept at constant volumemaximum and minimum thermometer - thermometer that records the highest and lowest temperatures reached during a period of timemeasuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of somethingmeat thermometer - a thermometer that is inserted into the center of a roast (with the top away from the heat source); used to measure how well done the meat ismercury thermometer, mercury-in-glass thermometer - thermometer consisting of mercury contained in a bulb at the bottom of a graduated sealed glass capillary tube marked in degrees Celsius or Fahrenheit; mercury expands with a rise in temperature causing a thin thread of mercury to rise in the tubeoven thermometer - a thermometer that registers the temperature inside an ovenpyrometer - a thermometer designed to measure high temperaturesReaumur thermometer - an alcohol thermometer calibrated in degrees Reaumurplatinum thermometer, resistance thermometer - thermometer that measures temperature by changes in the resistance of a spiral of platinum wirereversing thermometer - a thermometer that registers the temperature in deep watersself-registering thermometer - a thermometer that records the temperature automaticallytelethermometer - a thermometer that registers the temperature at some distant pointthermocouple, thermocouple junction - a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature differenceelectric thermometer, thermel, thermoelectric thermometer - a thermometer that uses thermoelectric current to measure temperaturethermometrograph, thermograph - a thermometer that records temperature variations on a graph as a function of timethermopile - a kind of thermometer for measuring heat radiation; consists of several thermocouple junctions in serieswet-bulb thermometer - a thermometer with a bulb that is covered with moist muslin; used in a psychrometer to measure humidity
Translations
温度计

thermometer

(θəˈmomitə) noun an instrument (usually a thin, glass tube with eg mercury in it) used for measuring temperature, especially body temperature. The nurse took his temperature with a thermometer. 溫度計 温度计

thermometer

→ 温度计zhCN

thermometer


thermometer,

instrument for measuring temperaturetemperature,
measure of the relative warmth or coolness of an object. Temperature is measured by means of a thermometer or other instrument having a scale calibrated in units called degrees. The size of a degree depends on the particular temperature scale being used.
..... Click the link for more information. . Galileo and Sanctorius devised thermometers consisting essentially of a bulb with a tubular projection, the open end of which was immersed in a liquid. Heating or cooling the bulb affected the height of the column of liquid in the tube, on which a scale was marked. Over a century later appeared the three thermometers now most widely used—the Fahrenheit, the centigrade (Celsius), and the Réaumur (used to some extent in parts of Europe). The first, invented by Fahrenheit c.1714 in Danzig, initiated the use of mercury as a heat-measuring medium; the thermometer of Réaumur, invented c.1730, used alcohol; the Celsius, invented by Anders Celsius at Uppsala (probably 1742) is now most used in laboratory work. The clinical thermometer is a small tubular instrument of rather thick glass. It consists essentially of a small vacuum tube of uniform bore closed at one end and connected at the other with a mercury chamber (either a bulb or a short tube of larger bore). A Celsius or a Fahrenheit scale (or both) is etched on the front of the thermometer; opposite this the glass is milky or semiopaque, to facilitate reading the temperature. When heat is applied, the mercury expands and rises from the chamber past a narrowed point and up the small tube. This narrowed point prevents the mercury from sinking back until shaking forces it down. A thermocouple can be used as a thermometer for measuring temperatures outside the range of liquid-in-glass thermometers. It is based on the thermoelectric effect occurring when the two junctions of a closed loop made of two different metals are at different temperatures (see thermoelectricitythermoelectricity,
direct conversion of heat into electric energy, or vice versa. The term is generally restricted to the irreversible conversion of electricity into heat described by the English physicist James P.
..... Click the link for more information. ).

Thermometer

An instrument that measures temperature. Although this broad definition includes all temperature-measuring devices, they are not all called thermometers. Other names have been generally adopted. For a discussion of two such devices See Pyrometer, Thermocouple. See also T emperature measurement

Liquid-in-glass thermometer

This thermometer consists of a liquid-filled glass bulb and a connecting partially filled capillary tube. When the temperature of the thermometer increases, the differential expansion between the glass and the liquid causes the liquid to rise in the capillary. A variety of liquids, such as mercury, alcohol, toluene, and pentane, and a number of different glasses are used in thermometer construction, so that various designs cover diverse ranges between about -300°F and +1200°F (-184°C and +649°C).

Bimetallic thermometer

In this thermometer the differential expansion of thin dissimilar metals, bonded together into a narrow strip and coiled into the shape of a helix or spiral, is used to actuate a pointer. In some designs the pointer is replaced with low-voltage contacts to control, through relays, operations which depend upon temperature, such as furnace controls.

Filled-system thermometer

This type of thermometer has a bourdon tube connected by a capillary tube to a hollow bulb. When the system is designed for and filled with a gas (usually nitrogen or helium) the pressure in the system substantially follows the gas law, and a temperature indication is obtained from the bourdon tube. The temperature-pressure-motion relationship is nearly linear. Atmospheric pressure effects are minimized by filling the system to a high pressure. When the system is designed for and filled with a liquid, the volume change of the liquid actuates the bourdon tube.

Vapor-pressure thermal system

This filled-system thermometer utilizes the vapor pressure of certain stable liquids to measure temperature. The useful portion of any liquid-vapor pressure curve is between approximately 15 psia (100 kilopascals absolute) and the critical pressure, that is, the vapor pressure at the critical temperature, which is the highest temperature for a particular liquid-vapor system. A nonlinear relationship exists between the temperature and the vapor pressure, so the motion of the bourdon tube is greater at the upper end of the vapor-pressure curve. Therefore, these thermal systems are normally used near the upper end of their range, and an accuracy of 1% or better can be expected.

Resistance thermometer

In this type of thermometer the change in resistance of conductors or semiconductors with temperature change is used to measure temperature. Usually, the temperature-sensitive resistance element is incorporated in a bridge network which has a reasonably constant power supply. Although a deflection circuit is occasionally used, almost all instruments of this class use a null-balance system, in which the resistance change is balanced and measured by adjusting at least one other resistance in the bridge. Metals commonly used as the sensitive element in resistance thermometers are platinum, nickel, and copper.

Thermistor

This device is made of a solid semiconductor with a high temperature coefficient of resistance. The thermistor has a high resistance, in comparison with metallic resistors, and is used as one element in a resistance bridge. Since thermistors are more sensitive to temperature changes than metallic resistors, accurate readings of small changes are possible. See Thermistor

Thermometer

 

a device for measuring temperature through contact with the medium being studied. The uses of thermometers are extremely varied. There are household thermometers (room thermometers, thermometers for air and water, and clinical thermometers), industrial thermometers, and precision thermometers for experimental and meteorological work. The operation of thermometers is based on such physical properties as the thermal expansion of liquids, gases, and solids and on the temperature dependence of electrical resistance, thermal electromotive force, the magnetic susceptibility of a paramagnet, and the pressure of gases or saturated vapor.

The most common types of thermometers are liquid-filled, filled-system, resistance, and thermoelectric thermometers (see). In addition, condensation, gas, acoustic, and magnetic thermometers are used to measure low temperatures. There are also thermometers for special purposes—for example, meteorological thermometers, hypsometers, and deep-sea thermometers.

Bimetallic thermometers are sometimes used. Their operation is based on the difference in thermal expansion of the substances comprising the strips of their sensitive elements. There are also quartz thermometers, using the temperature dependence of the resonance frequency of a piezoelectric quartz crystal, and capacitance thermometers, using the dependence of the dielectric constant of ferroelectrics on temperature.

D. I. SHAREVSKAIA

thermometer

[thər′mäm·əd·ər] (engineering) An instrument that measures temperature.

thermometer

A device for measuring temperature.

thermometer


thermometer

 [ther-mom´ĕ-ter] an instrument for determining temperatures, in principle making use of a substance (such as alcohol or mercury) with a physical property that varies with temperature and is susceptible of measurement on some defined scale.Temperatures on Celsius and Fahrenheit thermometers related to temperature ranges. From Elkin et al., 2000.axilla thermometer a thermometer" >clinical thermometer that is placed in the axilla.Celsius thermometer one that uses the scale" >Celsius scale.centigrade thermometer one having the interval between two established reference points divided into 100 equal units, such as the thermometer" >Celsius thermometer.clinical thermometer one used to determine the temperature of the human body.electronic thermometer a thermometer" >clinical thermometer that uses a sensor based on thermistors, solid-state electronic devices whose electrical characteristics change with temperature. The reading is recorded within seconds, some having a red light or other device to indicate when maximum temperature is reached. Available models include hand-held, desk-top, and wall-mounted units, all having probes that are inserted orally or rectally.Fahrenheit thermometer one that uses the scale" >Fahrenheit scale.Kelvin thermometer one that uses the scale" >Kelvin scale.oral thermometer a thermometer" >clinical thermometer whose mercury containing bulb is placed under the tongue.recording thermometer a temperature-sensitive instrument by which the temperature to which it is exposed is continuously recorded.rectal thermometer a thermometer" >clinical thermometer that is inserted in the rectum.resistance thermometer one that uses the electric resistance of metals (thermocouple) to determine temperature.self-registering thermometer 1. recording thermometer.2. one that registers the maximum or minimum temperature attained in the measurement.tympanic thermometer an electronic thermometer" >clinical thermometer that gives a digital reading in less than two seconds. Second-generation tympanic thermometers work by monitoring the temperature when the ear opening is sealed.

ther·mom·e·ter

(ther-mom'ĕ-tĕr), An instrument for indicating the temperature of any substance; often a sealed vacuum tube containing mercury, which expands with heat and contracts with cold, its level accordingly rising or falling in the tube, with the exact degree of variation of level being indicated by a scale, or, more recently, a device with an electronic sensor that displays the temperature without the use of mercury.
See also: scale. [thermo- + G. metron, measure]

thermometer

(thər-mŏm′ĭ-tər)n. An instrument for measuring temperature, especially one having a graduated glass tube with a bulb containing a liquid, typically mercury or colored alcohol, that expands and rises in the tube as the temperature increases.

ther·mom·e·ter

(thĕr-mom'ĕ-tĕr) An instrument for indicating the temperature of any substance; formerly a sealed vacuum tube containing mercury, which expands with heat and contracts with cold, its level accordingly rising or falling in the tube, with the exact degree of variation of level being indicated by a scale, but increasingly a digital apparatus.
See also: scale[thermo- + G. metron, measure]

thermometer

A device for registering body temperature. Thermometers may be analogue, as in the case of the common mercury expansion thermometer or colour-change devices, or may have a digital display.

ther·mom·e·ter

(thĕr-mom'ĕ-tĕr) An instrument for indicating temperature of any substance; often sealed vacuum tube containing mercury, which expands with heat and contracts with cold, its level accordingly rising or falling in the tube, with exact degree of variation of level being indicated by a scale, or, today, a device with an electronic sensor that displays temperature without use of mercury. [thermo- + G. metron, measure]
AcronymsSeeTHERM

thermometer


  • noun

Words related to thermometer

noun measuring instrument for measuring temperature

Related Words

  • alcohol thermometer
  • alcohol-in-glass thermometer
  • candy thermometer
  • capillary
  • capillary tube
  • capillary tubing
  • Centigrade thermometer
  • cryometer
  • dry-bulb thermometer
  • Fahrenheit thermometer
  • air thermometer
  • gas thermometer
  • maximum and minimum thermometer
  • measuring device
  • measuring instrument
  • measuring system
  • meat thermometer
  • mercury thermometer
  • mercury-in-glass thermometer
  • oven thermometer
  • pyrometer
  • Reaumur thermometer
  • platinum thermometer
  • resistance thermometer
  • reversing thermometer
  • self-registering thermometer
  • telethermometer
  • thermocouple
  • thermocouple junction
  • electric thermometer
  • thermel
  • thermoelectric thermometer
  • thermometrograph
  • thermograph
  • thermopile
  • wet-bulb thermometer
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更新时间：2025/1/31 3:09:30