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1. ÃâÁ¦¿øÄ¢
Á¦½Ã¹®À» Àаí, À¯ÀÇ»çÇ×À» ÂüÁ¶ÇÏ¿© ¹°À½¿¡ ´äÇϽÿÀ.

¡¼¹®Á¦£±¡½°úÇРŽ±¸¿¡¼­ ´ÜÀ§(unit)ÀÇ Á¤È®ÇÑ ÀÌÇØ´Â ¸Å¿ì Áß¿äÇÏ´Ù. <Á¦½Ã¹® °¡>ÀÇ ¨ç, ¨è, ¨éÀº °¢°¢ ¾î¶² ´ÜÀ§¸¦ Á¤ÀÇÇÑ °ÍÀÎÁö, ±×¸®°í ¾î´À °æ¿ì¿¡ »ç¿ëµÇ´ÂÁö¸¦ ±â¼úÇϽÿÀ. (100¡­200ÀÚ)

¡¼¹®Á¦£²¡½<Á¦½Ã¹® ³ª>ÀÇ ¨ë¿¡ ±Ù°ÅÇÏ¿©, 1900³â ÀÌÀü °úÇÐÀÚµéÀº ÃÊ(second)¸¦ ¾î¶»°Ô Á¤ÀÇÇÏ¿´À¸¸ç, ±×°ÍÀÌ ¿Ö ºÎÁ¤È®ÇÑÁö ¼³¸íÇÏ°í, ÃÖ±Ù¿¡´Â ÃÊ(second)¸¦ ¾î¶»°Ô Á¤ÀÇÇϸç, ÀÌ Á¤ÀÇÀÇ ÀåÁ¡Àº ¹«¾ùÀÎÁö ¼³¸íÇϽÿÀ. (200¡­300ÀÚ)

¡¼¹®Á¦£³¡½¿À´Ã³¯ ¿ì¸®´Â °úÇÐÀÚµéÀÇ Å½±¸ °á°ú¸¦ ½Å·ÚÇÏ°í ÀÖÀ¸¸ç, ±×µéÀÇ ÆÇ´ÜÀÌ ÀϹÝÀûÀ¸·Î Á»´õ °´°üÀûÀÌ°í ºÐ¼®ÀûÀ̸ç ÇÕ¸®ÀûÀÏ °ÍÀ̶ó°í ¹Ï´Â´Ù. °úÇÐÀÚµéÀº ÀÚ¿¬Çö»óÀ» Ž±¸ÇÏ´Â °úÁ¤¿¡¼­ À̸¦ Á¤·®È­ÇÏ´Â ¹æ¹ýÀÇ Çϳª·Î ½ÇÇèÀ» µµÀÔÇÏ¿´´Ù. ½ÇÇèÀÇ ¹ÙÅÁ¿¡´Â ÃøÁ¤À̶ó´Â Áß¿äÇÑ °úÁ¤ÀÌ ÀÖ´Ù. <Á¦½Ã¹®>ÀÇ ¨ê¿Í ¨ìÀ» ÂüÁ¶ÇÏ¿© °úÇÐÀÌ ¹«¾ùÀÎÁö, ±×¸®°í °úÇп¡¼­ ´ÜÀ§ÀÇ Á߿伺ÀÌ ¹«¾ùÀÎÁö¸¦ ³í¼úÇϽÿÀ. (500ÀÚ ¾ÈÆÆ)




2. ¹®Á¦
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¨ç ¾î¶² ¿ë¾×À̳ª ±âü°¡ 100¸¸ ºÐÀÇ 1ÀÇ ³óµµÀÏ ¶§ ³ªÅ¸³»´Â ´ÜÀ§ÀÌ´Ù.
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¨ë The division of time into hours, minutes, and seconds goes back to the Babylonians. The second used to be defined by Earth's rotation, as 1/(24 60 60) of a mean solar day, until it was recognized that the Earth's rotation is slowing slightly. The second was then redefined as a specific fraction of the year 1900. In 1967 the second was again redefined, now in terms of the vibration of a specific atom, to give our current definition. The device that implements this definition is called an atomic clock. Like the definition of the meter, the atomic-clock definition of the second is reproducible in any laboratory with the appropriate equipment.
¢ÑBabylonians ¹Ùºô·Ð »ç¶÷µé rotation ÀÚÀü mean Æò±ÕÀÇ
fraction ºÐ¼ö vibration Áøµ¿ current ÇöÀçÀÇ, ÃÖ±ÙÀÇ
implement ±¸ÇöÇÏ´Ù atomic clock ¿øÀڽðè
reproducible ÀçÇö °¡´ÉÇÑ

¨ì In fact, many advances in science depend on "quantitative" observations, those that involve measurements and the reporting of numerical information. ¡¤ ¡¤ ¡¤ We measure a property of a sample by comparing it with a standard "unit" of that property. An example of a unit of length is "1 inch." The length of, say, a uranium rod may be reported as 5.0 inches only if everyone knows exactly what is meant by "1 inch." To make sure that everyone does, the different units are carefully defined at international meetings, and the definitions are then publicized around the world.

¢Ñquantitative Á¤·®Àû numerical ¼öÄ¡Àû uranium rod ¿ì¶ó´½ ºÀpublicize °øÇ¥ÇÏ´Ù



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