The fin parameter, $m$ is defined as

$m=(\frac{h}{k}{A}_C{)}^{\frac{1}{2}}$

$m=(h\frac{P}{k}{A}_C{)}^{\frac{1}{2}}$

$)$

$m=(h\frac{P}{k})$

$m=(h\frac{L}{k}{)}^{\frac{1}{2}}$