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Metric prefixes are defined spanning 10 −30 to 10 30, 60 decimal orders of magnitude which may be used in conjunction with the metric base unit of second. Metric units of time larger than the second are most commonly seen only in a few scientific contexts such as observational astronomy and materials science, although this depends on the author.
The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10 −2 metres ( 1 / 100 m = 0.01 m). To help compare different orders of magnitude , this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm).
An order of magnitude describes the link between two amounts. The difference between each amount step is usually 10, with each order being either 10 times greater or 10 times smaller than the next amount. This makes the scale easy to manipulate using logarithms.
The base unit for time is seconds. Some of the conversion units of time are, 1 minute = 60 seconds, 1 hour = 60 minutes, 1 day = 24 hours, 1 week = 7 days, 1 year = 12 months, or 1 year = 365 days. We use a clock or watch to tell the current time. A stopwatch can be used to measure the time in seconds.
10 −6 s: One millionth of a second. Symbol is μs millisecond: 10 −3 s: One thousandth of a second. Shortest time unit used on stopwatches. jiffy (electronics) ~ 10 −3 s: Used to measure the time between alternating power cycles. Also a casual term for a short period of time. centisecond: 10 −2 s: One hundredth of a second. decisecond ...
11 sie 2014 · Powers of Ten – Metric Prefixes. Prefixes for the powers of ten are grouped into sets of three zeros, with smaller increments near the number 1. Scientific notation is a useful means to write out very large or very small numbers using powers of ten and exponents.
For example, a scale of 1:100,000 (one to one hundred thousand) means 1 centimeter on the map equals 100,000 centimeters (1km) on the ground. The following is a list of scales and equivalent ground distances for three distances measured on an image.
