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Reference.org
Microsecond
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<p>A microsecond is a unit of <a href="/facts/Time/HceJKUGB">time</a> in the <a href="/facts/International_System_of_Units/S7YLglNz">International System of Units</a> (SI) equal to one <a href="/facts/Millionth/eakBCzTK">millionth</a> (0.000001 or 10−6 or 1⁄1,000,000) of a <a href="/facts/Second/jtFxnJXx">second</a>. Its symbol is μs, sometimes simplified to us when <a href="/facts/Unicode/DDu3MfPV">Unicode</a> is not available. </p><p>A microsecond is to one second, as one second is to approximately 11.57 days. </p><p>A microsecond is equal to 1000 <a href="/facts/Nanosecond/gARLTp4c">nanoseconds</a> or 1⁄1,000 of a <a href="/facts/Millisecond/xHCyv235">millisecond</a>. Because the next <a href="/facts/Metric_prefix/Y2MzkaeL">SI prefix</a> is 1000 times larger, measurements of 10−5 and 10−4 seconds are typically expressed as tens or hundreds of microseconds. </p>