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<title>GNU Scientific Library – Reference Manual: Prefixes</title>
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<a name="Prefixes"></a>
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<p>
Next: <a href="Physical-Constant-Examples.html#Physical-Constant-Examples" accesskey="n" rel="next">Physical Constant Examples</a>, Previous: <a href="Force-and-Energy.html#Force-and-Energy" accesskey="p" rel="previous">Force and Energy</a>, Up: <a href="Physical-Constants.html#Physical-Constants" accesskey="u" rel="up">Physical Constants</a> [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Prefixes-1"></a>
<h3 class="section">44.16 Prefixes</h3>
<a name="index-prefixes"></a>
<a name="index-constants_002c-prefixes"></a>
<p>These constants are dimensionless scaling factors.
</p>
<dl compact="compact">
<dt><code>GSL_CONST_NUM_YOTTA</code></dt>
<dd><p><em>10^24</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_ZETTA</code></dt>
<dd><p><em>10^21</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_EXA</code></dt>
<dd><p><em>10^18</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_PETA</code></dt>
<dd><p><em>10^15</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_TERA</code></dt>
<dd><p><em>10^12</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_GIGA</code></dt>
<dd><p><em>10^9</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_MEGA</code></dt>
<dd><p><em>10^6</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_KILO</code></dt>
<dd><p><em>10^3</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_MILLI</code></dt>
<dd><p><em>10^-3</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_MICRO</code></dt>
<dd><p><em>10^-6</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_NANO</code></dt>
<dd><p><em>10^-9</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_PICO</code></dt>
<dd><p><em>10^-12</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_FEMTO</code></dt>
<dd><p><em>10^-15</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_ATTO</code></dt>
<dd><p><em>10^-18</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_ZEPTO</code></dt>
<dd><p><em>10^-21</em>
</p>
</dd>
<dt><code>GSL_CONST_NUM_YOCTO</code></dt>
<dd><p><em>10^-24</em>
</p></dd>
</dl>
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