Answer
$1.00Mg/m^3$
Work Step by Step
Water has a density of $1.94 slug/ft^3$. We are asked to convert it to SI units.
$1.94 slug/ft^3 *\frac{14.5938 kg}{1slug}*(\frac{1ft}{0.3048m})^3=999.8 kg/m^3$
$999.8 kg/m^3*\frac{1Mg}{1000kg}\approx1.00Mg/m^3$
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