| 单词 | kelvin |
| 例句 | When it decides there's too much oxygen, it starts collecting air in a tank and cooling it to 90 kelvin. The Martian 2011-01-01T00:00:00Z Color temperatures range from about 1,400 to 10,000 kelvin. These Lights Are Like a Mood Ring for Your Room 2018-05-08T04:00:00Z With a synestia-shaped system—and some water vapor from the icy planets to help the cooling process—an outburst matching the measured 1,000 kelvins was possible. Astronomers May Have Witnessed Worlds in Collision 2023-10-25T04:00:00Z They are bloated monsters with surface temperatures that can exceed 200,000 kelvins—30 times hotter than the sun—and radiation fields that can outshine the sun by factors of more than a million. Rare ‘Pinwheel’ Stars Are a Beautiful Astronomical Puzzle 2023-08-18T04:00:00Z But how do you bottle a plasma at a temperature of around 100 million kelvins, several times hotter than the center of the sun? What Is the Future of Fusion Energy? 2023-06-05T04:00:00Z The chips are at the hearts of massive contraptions encased in cryogenic systems that keep the chips close to 0 kelvin. Underdog Technologies Gain Ground in Quantum-Computing Race 2023-02-13T05:00:00Z But most superconductors must be cooled to temperatures only a few kelvin above absolute zero, a costly procedure limiting their practical applications. College Physics for AP Courses 2015-08-12T00:00:00Z If the temperature is in kelvin, volume and temperature are directly proportional. Chemistry 2019-02-14T00:00:00Z Thus, to convert Celsius degrees or kelvins to Fahrenheit degrees, it is necessary to multiply by 180/100 = 9/5. Astronomy 2016-10-13T00:00:00Z About 130 metric tons of liquid helium—about the weight of a midsize blue whale—keep 36,000 metric tons of the collider under 4 kelvin. Large Hadron Collider Seeks New Particles after Major Upgrade 2022-04-27T04:00:00Z In theory, in a crystal kept at a frosty temperature of two kelvins, the spin states should remain coherent for up to a month and a half, Bartholomew says. Quantum Astronomy Could Create Telescopes Hundreds of Kilometers Wide 2021-04-19T04:00:00Z The official temperature unit on this scale is the kelvin, which is abbreviated K, and is not accompanied by a degree sign. College Physics for AP Courses 2015-08-12T00:00:00Z Charles’s law states that the volume of a given amount of gas is directly proportional to its temperature on the kelvin scale when the pressure is held constant. Chemistry 2019-02-14T00:00:00Z To convert from Fahrenheit degrees to Celsius degrees or kelvins, it is necessary to multiply by 100/180 = 5/9. Astronomy 2016-10-13T00:00:00Z After its turbulent start, the top few meters of a magnetar would cool enough—still millions of degrees kelvin—to freeze into a crystal lattice of neutrons, electrons, and atomic nuclei. Nature’s most magnetic objects, ripped apart in starquakes, can unleash powerful flashes of light 2021-04-08T04:00:00Z One major challenge is to develop inductors that act at room temperature, rather than at the current temperatures of about 10 kelvin. Inductors enter the world of quantum mechanics 2020-10-06T04:00:00Z Thus, the magnitude of temperature differences is the same in units of kelvins and degrees Celsius. College Physics for AP Courses 2015-08-12T00:00:00Z Find the temperature of boiling ammonia on the kelvin and Celsius scales. Chemistry 2019-02-14T00:00:00Z When the temperature fell to 3,000 kelvins, however, the electrons slowed down enough to be captured by protons and created neutral atoms. How Astronomers Revolutionized Our View of the Cosmos 2020-09-01T04:00:00Z It shows a sharp transition between conducting and superconducting states when it is cooled to temperatures below 4.4 kelvin, which is needed for the current to completely switch between these states. One-way supercurrent achieved in an electrically polar film 2020-08-18T04:00:00Z In Hori and colleagues’ experiment, the helium target was cooled to a cryogenic temperature of about 2 kelvin. Exotic helium atom lit up 2020-05-05T04:00:00Z The kelvin is the SI unit used in scientific work. College Physics for AP Courses 2015-08-12T00:00:00Z The average kinetic energy of the gas molecules is proportional to the kelvin temperature of the gas. Chemistry 2019-02-14T00:00:00Z But after a bit of tweaking, he managed to create a bright yellowish white flash, indicating the temperature inside the vial was reaching about 3000 kelvins. Electricity turns garbage into graphene 2020-01-27T05:00:00Z But Spitzer used passive methods—reflective materials and radiators to shed heat into space—to cool most of the spacecraft to 40 kelvins. NASA infrared telescope says goodbye after 16-year run 2020-01-23T05:00:00Z If we lower temperature to much less than a single kelvin, the wave nature of matter becomes more pronounced and wavelike behaviors more important. The Coolest Physics You've Ever Heard Of 2020-01-20T05:00:00Z It is also the first to run with cryogenic mirrors, cooled to 20 kelvin. Giant iceberg, Nobel prizes and nuclear-fusion plans 2019-10-08T04:00:00Z Following the same approach, the equations for converting between the kelvin and Celsius temperature scales are derived to be: Chemistry 2019-02-14T00:00:00Z Second, the spectrum is very close to that of an object in thermal equilibrium at 2.726 kelvins above absolute zero. The Evolution of the Universe 2019-10-08T04:00:00Z It kept a smaller supply of liquid helium to chill the mirror and instruments to 12 kelvins or 5 kelvins, depending on which instrument was being used. NASA infrared telescope says goodbye after 16-year run 2020-01-23T05:00:00Z The authors demonstrate that, at temperatures up to about 100 kelvin, several features of this light depend only on the exciton density. Two-dimensional semiconductors host high-temperature exotic state 2019-10-01T04:00:00Z Second, the nanomagnet chip works at room temperature, whereas the quantum computer would need refrigeration to keep it well under 1 kelvin. Stochastic magnetic circuits rival quantum computing 2019-09-17T04:00:00Z What is this temperature on the kelvin scale and on the Fahrenheit scale? Chemistry 2019-02-14T00:00:00Z At that point, the temperature was about 3,000 kelvins, cool enough to allow the ions and electrons to combine to form neutral hydrogen and helium. The Evolution of the Universe 2019-10-08T04:00:00Z Absolute zero, technically known as zero kelvins, equals −273.15 degrees Celsius, or -459.67 Fahrenheit, and marks the spot on the thermometer where a system reaches its lowest possible energy, or thermal motion. Racing toward Absolute Zero 2019-08-16T04:00:00Z When they added three electrons to each cell and dropped the temperature below 2 kelvins, they noticed a sharp drop in electrical resistance, a sign of superconductivity, which they report today in Nature. Trilayer graphene shows signs of superconductivity 2019-07-17T04:00:00Z Although most of its instruments could no longer function, the two shortest-wavelength cameras on the Infrared Array Camera continued to operate at the spacecraft temperature of 26 kelvin. The infrared Universe 2019-06-25T04:00:00Z Note that the pressure can be in any units, so long as they agree for both P values, but the temperature must be in kelvin for the Clausius-Clapeyron equation to be valid. Chemistry 2019-02-14T00:00:00Z The ampere, the kelvin and the mole are redefined using other experiments. CRISPR-baby rules, fake-news law and kilogram retires 2019-05-21T04:00:00Z To reach zero kelvins, you would require an infinite amount of work. Racing toward Absolute Zero 2019-08-16T04:00:00Z The ampere, the kelvin and the mole will be redefined using other experiments. Physical kilogram is officially dead 2019-05-19T04:00:00Z If the temperature is lowered to a few kelvin, radiation in the terahertz frequency range, which is relevant to such experiments, is suppressed. Correlations detected in a quantum vacuum 2019-04-09T04:00:00Z Convert the boiling temperature of gold, 2966 °C, into degrees Fahrenheit and kelvin. Chemistry 2019-02-14T00:00:00Z It is by far the most distant object ever visited by spacecraft, and correspondingly one of the coldest: about 35 kelvins, or nearly 400 degrees below zero Fahrenheit. Pluto Probe Encounters a Pristine World in the Solar System's Suburbs 2019-01-08T05:00:00Z Working at around just 1 to 10 millikelvins, or thousandths of a kelvin, the Cavendish team is in the process of surveying a variety of other materials that also show funky quantum behavior. Racing toward Absolute Zero 2019-08-16T04:00:00Z The ampere, the kelvin and the mole will also be redefined based on their relationships to the charge on the electron, Boltzmann’s constant and Avogadro’s number, respectively. Daily briefing: Exoplanet spotted orbiting Barnard’s star 2018-11-15T05:00:00Z In their vote, countries also unanimously approved updates to three other key units: the kelvin for temperature, the ampere for electrical current and the mole for the amount of a substance. The Latest: Landmark change to kilogram approved 2018-11-16T05:00:00Z Convert the temperature of scalding water, 54 °C, into degrees Fahrenheit and kelvin. Chemistry 2019-02-14T00:00:00Z In total, four units will be given new definitions: the kilogram, the ampere, the kelvin, and the mole. Why we’re killing the kilogram for a new one 2018-11-13T05:00:00Z These include the kelvin, the basic unit of temperature, as well as constants that define electric current and luminous intensity. The future of the kilo: a weighty matter 2018-11-03T04:00:00Z First, the authors demonstrated spin transport in an antiferromagnetic insulator over a relatively long distance — tens of micrometres at a temperature of 200 kelvin. Spins travel far in an antiferromagnet 2018-09-11T04:00:00Z The association urged municipalities to adopt LED streetlights that are less blue — no greater than 3,000 kelvins, a measure of color temperature — a recommendation that it continues to make. Takoma Park looks to new LED lights to save money, energy 2018-09-09T04:00:00Z Convert the temperature of the coldest area in a freezer, −10 °F, to degrees Celsius and kelvin. Chemistry 2019-02-14T00:00:00Z Using imaging tools such as piezoresponse force microscopy, the authors observed a polarization perpendicular to the plane of the film that is stable at temperatures of up to 700 kelvin. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z In particular, around 5 × 108 kelvin, the reaction rate is boosted to more than 25 times larger than the reference value5. An increase in the 12C + 12C fusion rate from resonances at astrophysical energies 2018-05-22T04:00:00Z To get started you need to understand the most critical measurements, lumens, kelvin and the color rendering index. What to look for when buying light bulbs 2018-04-05T04:00:00Z The temperature of interstellar space is typically given as that of the cosmic microwave background radiation that permeates the universe: about 2.7 kelvins. Readers Respond to the December 2017 Issue 2018-04-01T04:00:00Z The label on a pressurized can of spray disinfectant warns against heating the can above 130 °F. What are the corresponding temperatures on the Celsius and kelvin temperature scales? Chemistry 2019-02-14T00:00:00Z Judd Bowman and colleagues report the observation of an absorption profile centred at a frequency of 78 MHz that is about 19 MHz wide and 0.5 kelvin deep. Possible interaction between baryons and dark-matter particles revealed by the first stars 2018-02-27T05:00:00Z In a paper published in Nature, Kitagawa et al.1 describe the synthesis and properties of a remarkable quantum magnet in which the ballet of spins persists down to a temperature of 0.05 kelvin. The two faces of a magnetic honeycomb 2018-02-13T05:00:00Z If such transitions can be boosted to room temperature, around 300 kelvin, those superconductors could allow for cheaper energy, medical imaging and transportation. A quantum pioneer unlocks matter’s hidden secrets 2017-09-26T04:00:00Z Cornell and Wieman were trying to cool a puff of rubidium gas to within a few billionths of a degree of absolute zero—colder than any place in nature, even the 2.73 kelvins of space. Coolest science ever headed to the space station 2017-09-07T04:00:00Z Convert the temperature of dry ice, −77 °C, into degrees Fahrenheit and kelvin. Chemistry 2019-02-14T00:00:00Z And the temperature of the tritium source must be kept at a frigid 30 kelvins to slow the molecules so their motion doesn't affect the energy of the ejected electrons. Weighing the universe's most elusive particle 2017-06-29T04:00:00Z However, all of these compounds become magnetically ordered below a few kelvin, which excludes them as genuine realizations of Kitaev’s model. The two faces of a magnetic honeycomb 2018-02-13T05:00:00Z That means the planet is only 1,200 degrees kelvin cooler than the surface of our sun. Astronomers discover a planet so hot that it glows like a star 2017-06-06T04:00:00Z Natterer and his team used atoms of holmium, a rare-earth metal, sitting on a sheet of magnesium oxide, at a temperature below 5 kelvin. Magnetic hard drives go atomic 2017-03-07T05:00:00Z Convert the boiling temperature of liquid ammonia, −28.1 °F, into degrees Celsius and kelvin. Chemistry 2019-02-14T00:00:00Z Lighting is measured by color temperature, which is expressed in “kelvin,” or “K.” Some cities are taking another look at LED lighting after AMA warning 2016-09-21T04:00:00Z H3LiIr2O6 is a remarkable compound: it is the first iridium-based honeycomb magnet that does not become magnetically ordered at temperatures below a few kelvin. The two faces of a magnetic honeycomb 2018-02-13T05:00:00Z Other materials have produced superconductivity at high temperatures, but the mechanism by which hydrogen sulfide operates has never achieved superconductivity above 40 kelvin. 365 days: Nature’s 10 2015-12-16T05:00:00Z This will include a discussion of the draft resolution that is expected to redefine the ampere, mole, kelvin and kilogram at the General Conference on Weights and Measures in 2018. Kilogram conflict resolved at last 2015-10-13T04:00:00Z When this line is extrapolated to lower pressures, it reaches a pressure of 0 at –273 °C, which is 0 on the kelvin scale and the lowest possible temperature, called absolute zero. Chemistry 2019-02-14T00:00:00Z Now, LEDs are available with lower kelvin ratings and roughly the same energy efficiency as those with higher ratings. Some cities are taking another look at LED lighting after AMA warning 2016-09-21T04:00:00Z The researchers captured these atoms in a mist of cadmium iodide and deposited them onto a metal surface heated to more than 2,700 kelvin. Exotic atom struggles to find its place in the periodic table 2015-04-07T04:00:00Z The correct expression would have been “11 kelvins.” A measure without degree D–T is widely regarded as the only sane choice for a power reactor because it ignites at a lower temperature than any other combination — only about 100 million kelvin — and releases much more energy. Plasma physics: The fusion upstarts 2014-07-22T04:00:00Z Under either name, it states that the pressure of a given amount of gas is directly proportional to its temperature on the kelvin scale when the volume is held constant. Chemistry 2019-02-14T00:00:00Z Fusion power demands heating certain isotopes of hydrogen or other light elements to hundreds of millions of kelvin until they form ionized plasma. Fusion furore 2014-07-22T04:00:00Z Detecting the tiny B mode required measuring the CMB with a precision of one ten-millionth of a kelvin and distinguishing the primordial effect from other possible sources, such as galactic dust. Telescope captures view of gravitational waves 2014-03-19T18:20:36.133Z Temperatures of more than 2,000 kelvin, exceeding that of molten steel, must be achieved at the same time to reproduce the deep-Earth conditions in the laboratory. Earth science: Crystallography's journey to the deep Earth 2014-02-26T18:21:20.042Z Igniting this p–11B fuel would require temperatures of about a billion kelvin, almost 100 times as hot as the core of the Sun. Plasma physics: The fusion upstarts 2014-07-22T04:00:00Z Celsius degrees are the same magnitude as those of kelvin, but the two scales place their zeros in different places. Chemistry 2019-02-14T00:00:00Z As a function of temperature, an upturn in the drag resistance is observed below a temperature kelvin. [Report] 1D-1D Coulomb Drag Signature of a Luttinger Liquid 2014-02-06T19:26:25.955Z The boundary between Earth's core and mantle defines where the iron-rich liquid outer core meets the more chemically heterogeneous solid lower mantle and is marked by a sharp thermal gradient of nearly 1500 kelvin. [Report] Low Core-Mantle Boundary Temperature Inferred from the Solidus of Pyrolite 2014-01-30T19:26:05.902Z Still, the amp is in good shape for the November meeting, as is the kelvin. Ampere to get rational redefinition 2014-01-15T18:20:56.465Z An ultracold atom is an atom that is controlled at temperatures close to 0 kelvins or temperature of absolute zero. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z That changed in February last year, when physicists at Tsinghua University in Beijing reported interface superconductivity at about 80 kelvin — above the temperature of liquid nitrogen. Interface superconductivity found in single crystal 2013-09-25T17:20:25.733Z “We hope that eventually by international agreement our measurements and others will ‘fix’ the Boltzmann constant so that forever after we define temperature as a certain number of joules per degree kelvin.” Uncommon Measure: Acoustic Result Could Change Definition of Temperature 2013-07-11T21:45:23.407Z The experimentally determined maximum melting point of 3570 kelvin suggests that some phases typically thought to lose stability in the lowermost mantle, such as MgSiO-rich post-perovskite, may be more widely distributed than expected. [Report] Low Core-Mantle Boundary Temperature Inferred from the Solidus of Pyrolite 2014-01-30T19:26:05.902Z In the corona, the expansive outer layer of the solar atmosphere that extends millions of kilometers from the sun’s surface, temperatures reach millions of kelvins. Why Does the Sun s Corona Get So Hot? NASA Launches Telescope to Find Out 2013-06-25T14:45:05.407Z Their giant but crude microwave receiver saw the radiation as being the same in all directions, occurring at 2.7 kelvin. Planck snaps infant Universe 2013-03-27T18:20:16.717Z But physicists have shown that the stacking effect, called interface superconductivity, can occur at temperatures up to almost 80 kelvin. Interface superconductivity found in single crystal 2013-09-25T17:20:25.733Z But these cores formed under the weight of their planets’ outer layers, under pressures of around 500 gigapascals — 5 million times atmospheric pressure on Earth — and typical temperatures of about 6,000 kelvin. Puzzling Super-Dense Space Objects Could Be a New Type of Planet 2013-03-14T14:45:00.370Z This shady perch, together with 2,300 litres of liquid helium, allowed Herschel to cool its instruments to a chilly 2.2 kelvin. Cold telescope faces hot death 2013-03-13T18:20:25.743Z The highest phase-transition temperature for the composite was 150 kelvin above absolute zero — too low for practical applications. Metal oxide chips show promise 2013-03-06T18:20:29.690Z Seen in the map as tiny variations around an average temperature of 2.7 kelvins, the fluctuations caused alterations in the density of matter, which ultimately snowballed into the galaxies seen today. Planck snaps infant Universe 2013-03-27T18:20:16.717Z Those results suggest that the material is insulating in its interior at temperatures below around 30 kelvin. Exotic Quantum Effects Could Follow from Compound Now Confirmed to Conduct Only at Surface 2012-12-11T23:15:00.247Z And worst of all, he said, before use the system had to be cooled down to 4 kelvin — a process that took 16 hours. Microwave weapons: Wasted energy 2012-09-12T17:21:24.203Z The General Conference on Weights and Measures meets in Sèvres, near Paris, to discuss how to redefine the kilogram, ampere, kelvin and mole. Seven days: 13 October 2011 2011-10-12T17:20:21.333Z Using the latest values for Boltzmann's constant, the kelvin could also be redefined with ease, says Mohr. Fundamental Physical Constants Get Updated Values 2011-07-27T01:45:03.507Z As spicules measuring in the tens of thousands of degrees kelvins rise from the chromosphere, the researchers noticed, patches of the corona above flare up at one million to two million degrees. Feeling the Heat 2011-02-15T05:16:57.373Z The SI system comprises seven units of measure, some of which may not be so familiar: the metre, kilogram, second, ampere, candela, kelvin, and mole. Weight loss 2011-01-26T00:17:42Z |
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