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--- manual:chapter3:units [2019/09/14 07:03]
jojo1973 Fixed some typos and capitalization
+++ manual:chapter3:units [2019/09/18 16:30]
jojo1973 [Multiples and Submultiples]
@@ Line 22: / Line 22: @@
 Exponents within a unit expression can be integer numbers, real numbers or fractional exponents. The use of fractional exponents is always preferred over real numbers because they can be simplified in an exact way. \\
 ''3_[m^(2/3)]'' is always preferred to ''3_[m^0.666667]'' \\
+==== Multiples and Submultiples ====
+Multiples and submultiples of many units are obtained by prefixing them with the standard SI prefixes. Therefore, ''1_dal'' is equivalent to ''10_l'' and ''3.5_MHz'' is equivalent to ''3500000_Hz''.
+There is only one exception: prefixes can't be used if the resulting name matches an already existing unit. For example, it's not possible use ''_[min]'' to mean milliinches because ''_[min]'' is already defined and corresponds to the time unit "minute".
+^  SI Prefix  ^  Factor  ^  Name  ^
+|  Y   |  $10^{24}$   |  yotta-  |
+|  Z   |  $10^{21}$   |  zetta-  |
+|  E   |  $10^{18}$   |  exa-    |
+|  P   |  $10^{15}$   |  peta-   |
+|  T   |  $10^{12}$   |  tera-   |
+|  G   |  $10^{9}$    |  giga-   |
+|  M   |  $10^{6}$    |  mega-   |
+|  k   |  $10^{3}$    |  kilo-   |
+|  h   |  $10^{2}$    |  hecto-  |
+|  da  |  $10^{1}$    |  deka-   |
+|  d   |  $10^{-1}$   |  deci-   |
+|  c   |  $10^{-2}$   |  centi-  |
+|  m   |  $10^{-3}$   |  milli-  |
+|  µ   |  $10^{-6}$   |  micro-  |
+|  n   |  $10^{-9}$   |  nano-   |
+|  p   |  $10^{-12}$  |  pico-   |
+|  f   |  $10^{-15}$  |  femto-  |
+|  a   |  $10^{-18}$  |  atto-   |
+|  z   |  $10^{-21}$  |  zepto-  |
+|  y   |  $10^{-24}$  |  yocto-  |
 ==== Operating with Units ====
@@ Line 34: / Line 62: @@
 To extract the value part of a unit object, use the ''UVAL'' command, which will return the object without its unit.
 ==== Custom Units ====