Synonyms for for a second include momentarily, briefly, temporarily, fleetingly, immediately, instantly, now, for a minute, for a moment and for the nonce. ‘A second doctor must be consulted, and life must be ended in a medically appropriate way.’ ‘Before we left, a second waitress appeared and things speeded up markedly.’ ‘In forensic science laboratories, a second scientist validates each case.’ ‘A second type of contractual-debt subordination is a contingency debt arrangement.’ for that moment. So a clock with 60 divisions would have a mark for thirds, fourths, fifths, sixths and twelfths (the hours); whatever units the clock would likely keep time in, would have marks. The second car has crossed the finished line. In scientific work, small fractions of a second are counted in milliseconds (thousandths), microseconds (millionths), nanoseconds (billionths), and sometimes smaller units of a second. Second Mortgages: How They Work, Advantages and Disadvantages Many derivative units for everyday things are reported in terms of larger units of time, not seconds, such as clock time in hours and minutes, velocity of a car in kilometers per hour or miles per hour, kilowatt hours of electricity usage, and speed of a turntable in rotations per minute. [11] What's the difference between lid and cap? What's the difference between freedom and ''the freedom'' here? There are references to 'second' as part of a lunar month in the writings of natural philosophers of the Middle Ages, which were mathematical subdivisions that could not be measured mechanically. The only base unit whose definition does not depend on the second is the mole. Making statements based on opinion; back them up with references or personal experience. for a couple seconds. [17], SI prefixes are commonly used for times shorter than one second, but rarely for multiples of a second. In 1832, Gauss proposed using the second as the base unit of time in his millimeter-milligram-second system of units. [citation needed] Small divisions of time could not be measured back then, so such divisions were mathematically derived. Some common events in seconds are: a stone falls about 4.9 meters from rest in one second; a pendulum of length about one meter has a swing of one second, so pendulum clocks have pendulums about a meter long; the fastest human sprinters run 10 meters in a second; an ocean wave in deep water travels about 23 meters in one second; sound travels about 343 meters in one second in air; light takes 1.3 seconds to reach Earth from the surface of the Moon, a distance of 384,400 kilometers. What does not for a second expression mean? Mechanical clocks kept the mean time, as opposed to the apparent time displayed by sundials. How to use second in a sentence. An everyday experience with small fractions of a second is a 1-gigahertz microprocessor which has a cycle time of 1 nanosecond. not a second. Like some example usages? "[12] BAAS formally proposed the CGS system in 1874, although this system was gradually replaced over the next 70 years by MKS units. Although the historical definition of the unit was based on this division of the Earth's rotation cycle, the formal definition in the International System of Units (SI) is a much steadier timekeeper: The second is defined as being equal to the time duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the fundamental unperturbed ground-state of the caesium-133 atom.[1][2]. [nb 4], The earliest clocks to display seconds appeared during the last half of the 16th century. That means that every second, minute and every other division of time counted by the clock will be the same duration as any other identical division of time. It rarely makes sense to express longer periods of time like hours or days in seconds, because they are awkwardly large numbers. Re-elected on 12 January 2011 for a second three-year term. Children's counting problems: Is this question phrased correctly? Wait, do we have a second second too? Digital clocks and watches … The international standard for timekeeping is Coordinated Universal Time (UTC). [13] In 1955, the tropical year, considered more fundamental than the sidereal year, was chosen by the IAU as the unit of time. The second (symbol: s, abbreviation: sec) is the base unit of time in the International System of Units (SI) (French: Système International d’unités), commonly understood and historically defined as ​ ⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each. für einen Moment (ganz) kurz [für einen Moment] for the second time in less than a day {adv} zum zweiten Mal innerhalb eines knappen Tages I'll just drop in for a second. Of the 22 named derived units of the SI, only two (radian and steradian), do not depend on the second. The second (symbol: s, abbreviation: sec) is the base unit of time in the International System of Units (SI) (French: Système International d’unités), commonly understood and historically defined as .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each. Commonly, when referring to the ordinal second, you'll see it describing something else: Adding to the confusion, the ordinal can refer to "prize" or "place" without adding those additional words and still be valid English: However, you'll commonly see ordinals with other ordinals: When second is being used as a unit of time, they'll have a context relating to time: Just to reiterate, the context is what will tell you one way or the other, and why writing grammatically correct English can be very important. The effect is due chiefly to the obliqueness of Earth's axis with respect to its orbit around the sun. The British Association for the Advancement of Science (BAAS) in 1862 stated that "All men of science are agreed to use the second of mean solar time as the unit of time. The second became accurately measurable with the development of mechanical clocks. By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. But even the best mechanical, electric motorized and quartz crystal-based clocks develop discrepancies from environmental conditions. That puts Mary in first, Jesse in second, and King in third... First, we break into the bank. for awhile. Who detonated the car bomb in the finale of "The Falcon and the Winter Soldier"? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. But a sundial which measures the relative position of the sun in the sky called apparent time, does not keep uniform time. A mechanical clock, one which does not depend on measuring the relative rotational position of the Earth, keeps uniform time called mean time, within whatever accuracy is intrinsic to it. Fractions of a second are usually denoted in decimal notation, for example 2.01 seconds, or two and one hundredth seconds. Analog clocks and watches often have sixty tick marks on their faces, representing seconds (and minutes), and a "second hand" to mark the passage of time in seconds. The Ottawa Citizen’s Meghan Hurley is reporting that package contained a hand.". Here the "second" means 2nd, not 1/60 minutes. Can you give some more context? There are other expressions for the second. For other uses, see, Sexagesimal divisions of calendar time and day. While they are not yet part of any timekeeping standard, optical lattice clocks with frequencies in the visible light spectrum now exist and are the most accurate timekeepers of all. [5] UT1 always differs from UTC by less than a second. Is there a closed form formula for counting 2-regular labelled graphs? It had a pendulum length of just under a meter which gave it a swing of one second, and an escapement that ticked every second. Atomic clocks use such a frequency to measure seconds by counting cycles per second at that frequency. This answer is going to assume that your question ultimately expands to be: How do I tell the difference between the ordinal and the unit of time? a second helping: eine zweite Portion {f} a split second: ein Bruchteil {m} einer Sekunde: just a second: nur eine Sekunde {f} a little second [Diminutiv] Sekündchen {n} [ugs.] It only takes a minute to sign up. Ongoing effort to detect MitM attack on TLS? Starting in the 1950s, atomic clocks became better timekeepers than Earth's rotation, and they continue to set the standard today. just a minute. A set of atomic clocks throughout the world keeps time by consensus: the clocks "vote" on the correct time, and all voting clocks are steered to agree with the consensus, which is called International Atomic Time (TAI). The meter is defined in terms of the speed of light and the second; definitions of the metric base units kilogram, ampere, kelvin, and candela also depend on the second. what's the difference between “the” and blank? Second goes to Nutley. Is the speaker confused about there being more than one person earning second-place? stop short. Some time in the late 1940s, quartz crystal oscillator clocks with an operating frequency of ~100 kHz advanced to keep time with accuracy better than 1 part in 108 over an operating period of a day. split second. In fact, the hour was not commonly divided in 60 minutes as it was not uniform in duration. The second is also part of several other units of measurement like meters per second for speed, meters per second per second for acceleration, and cycles per second for frequency. [nb 2][nb 3], The earliest mechanical clocks which appeared starting in the 14th century had displays that divided the hour into halves, thirds, quarters and sometimes even 12 parts, but never by 60. Because the Earth's rotation varies and is also slowing ever so slightly, a leap second is periodically added to clock time[nb 1] to keep clocks in sync with Earth's rotation. previous. for a few seconds. If you have previously received a Paycheck Protection Program (PPP) loan, certain businesses are eligible for a Second Draw PPP loan.
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