input: Make use of the article to answer the questions. The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics. The kelvin (symbol: K) is the base unit of temperature in the International System of Units (SI). The kelvin is defined as the fraction of the thermodynamic temperature of the triple point of water (exactly 0.01 °C or 32.018 °F). In other words, it is defined such that the triple point of water is exactly 273.16 K. 

The Kelvin scale is named after the Belfast-born, Glasgow University engineer and physicist William Thomson, 1st Baron Kelvin (1824–1907), who wrote of the need for an "absolute thermometric scale". Unlike the degree Fahrenheit and degree Celsius, the kelvin is not referred to or typeset as a degree. The kelvin is the primary unit of temperature measurement in the physical sciences, but is often used in conjunction with the degree Celsius, which has the same magnitude. The definition implies that absolute zero (0 K) is equivalent to . 

In 1848, William Thomson, who later was made Lord Kelvin, wrote in his paper, "On an Absolute Thermometric Scale", of the need for a scale whereby "infinite cold" (absolute zero) was the scale's null point, and which used the degree Celsius for its unit increment. Kelvin calculated that absolute zero was equivalent to −273 °C on the air thermometers of the time. This absolute scale is known today as the Kelvin thermodynamic temperature scale. Kelvin's value of "−273" was the negative reciprocal of 0.00366—the accepted expansion coefficient of gas per degree Celsius relative to the ice point, giving a remarkable consistency to the currently accepted value. 1. What activity stops at absolute zero?
2. On which scale is it the null point?
3. For whom is the Kelvin scale named?
4. What was his title?
5. When was he born?
6. Where?
7. When did he die?
8. What school did he work at?
9. What paper did Lord Kelvin write?
10. When?
numbered_answers: 1. all thermal motion
2. The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
3. William Thomson,
4. 1st Baron Kelvin
5. 1824
6. Belfast
7. T1907
8. Glasgow University
9. "On an Absolute Thermometric Scale",
10. 1848

input: Infrared radiation is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected. Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space, such as molecular clouds; detect objects such as planets, and to view highly red-shifted objects from the early days of the universe. Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus. 

The onset of infrared is defined (according to different standards) at various values typically between 700 nm and 800 nm, but the boundary between visible and infrared light is not precisely defined. The human eye is markedly less sensitive to light above 700 nm wavelength, so longer wavelengths make insignificant contributions to scenes illuminated by common light sources. However, particularly intense near-IR light (e.g., from IR lasers, IR LED sources, or from bright daylight with the visible light removed by colored gels) can be detected up to approximately 780 nm, and will be perceived as red light. Sources providing wavelengths as long as 1050 nm can be seen as a dull red glow in intense sources, causing some difficulty in near-IR illumination of scenes in the dark (usually this practical problem is solved by indirect illumination). Leaves are particularly bright in the near IR, and if all visible light leaks from around an IR-filter are blocked, and the eye is given a moment to adjust to the extremely dim image coming through a visually opaque IR-passing photographic filter, it is possible to see the Wood effect that consists of IR-glowing foliage. 1. what doesn't have a precise definition? Return numbered answers in your output.

output: 1. the boundary between visible and infrared light

Q: CHAPTER XXXIX. 

A NEW FLIRTATION. 

[Illustration] 

John Eames sat at his office on the day after his return to London, and answered the various letters which he had found waiting for him at his lodgings on the previous evening. To Miss Demolines he had already written from his club,--a single line, which he considered to be appropriate to the mysterious necessities of the occasion. "I will be with you at a quarter to six to-morrow.--J. E. Just returned." There was not another word; and as he scrawled it at one of the club tables while two or three men were talking to him, he felt rather proud of his correspondence. "It was capital fun," he said; "and after all,"--the "all" on this occasion being Lily Dale, and the sadness of his disappointment at Allington,--"after all, let a fellow be ever so down in the mouth, a little amusement should do him good." And he reflected further that the more a fellow be "down in the mouth," the more good the amusement would do him. He sent off his note, therefore, with some little inward rejoicing,--and a word or two also of spoken rejoicing. "What fun women are sometimes," he said to one of his friends,--a friend with whom he was very intimate, calling him always Fred, and slapping his back, but whom he never by any chance saw out of his club. 

"What's up now, Johnny? Some good fortune?" 

"Good fortune; no. I never have good fortunes of that kind. But I've got hold of a young woman,--or rather a young woman has got hold of me, who insists on having a mystery with me. In the mystery itself there is not the slightest interest. But the mysteriousness of it is charming. I have just written to her three words to settle an appointment for to-morrow. We don't sign our names lest the Postmaster-General should find out all about it." 

Answer the following questions:
1. who never had good fortunes ?
2. who sat at the office ?
3. where did he come from ?
4. what was waiting for him ?
5. did he answer them ?
6. he wrote 1 single line to who ?
7. who just returned ?
8. what happened at Allington
9. of what ?
10. what helps if you are down at the mouth ?
11. and the more a fellow is down what more ?
12. did he send this note ?
13. who sat in the office ?
14. last name ?
15. what time was it to meet with someone ?
16. what day ?
17. what did je do ?
18. how many men were talking to him ?
A:
1. Johnny
2. John Eames
3. London
4. letters
5. yes
6. Miss Demolines
7. J. E
8. sadness
9. his disappointment
10. amusement
11. he more good the amusement
12. yes
13. John
14. Eames
15. quarter to six
16. to-morrow
17. returned
18. wo or three men