Second

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Second, a unit in the metric system, is used to measure time and angles. Its symbol is s. In measuring time, 60 seconds make up 1 minute. There are 60 minutes in 1 hour, and 24 hours in a day, and so a second is 1/86,400 of a day. In measuring angles, 60 seconds make up 1 minute, and there are 60 minutes in 1 degree. A circle is divided into 360 degrees. Thus, a second is 1/1,296,000 of a circle.

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Micrometer, MY kroh mee tuhr, also called micron, is a metric unit of length. One micrometer is equal to 0.000001 meter, or 1/25,400 inch. The… See more »

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