Answer
$3.14159\times10^{0}$
Work Step by Step
Using $a\times10^n$, where $1\le a\le9,$ and $n$ is an integer, the scientific notation of the given expression, $
3.14159
,$ is
\begin{array}{l}\require{cancel}
3.14159
\times1
\\\\=
3.14159\times10^{0}
.\end{array}