# What is the volume of a platinum ring having a mass of 5.4 oz?

Sep 14, 2016

Approx. $7 \cdot c {m}^{3}$

#### Explanation:

$\rho , \text{density } P t = 21.45 \cdot g \cdot c {m}^{-} 3$.

Now (after finding out that $1 \cdot o z = 28.35 \cdot g$), our calculation is:

$\frac{28.35 \cdot \cancel{g} \cdot \cancel{o {z}^{-} 1} \times 5.4 \cdot \cancel{o z}}{21.45 \cdot \cancel{g} \cdot c {m}^{-} 3}$ $\cong$ $7 \cdot c {m}^{3}$

I think platinum is currently trading at \$1000" USD"*oz^-1, so don't lose that ring!