Question about conversions?

Question

How do I calculate the thickness of a piece of copper foil with a mass of 0.0112 pound and a density of 8.92 g/mL if the lenght of the piece of copper is 0.024 m an the width is 2.4 x 10^4 um?

Answer 1

First convert the pounds of copper into grams (this is not exact, since pounds is weight and grams is mass, but it will be close enough). 1.00 lb = 453.6 grams

0.0112 lb * 453.6 g/lb = 5.08 grams

Then find the volume of this mass of copper by dividing the mass by the density of copper.

5.08 g / 8.92 g/mL = 0.5695 mL

1.00 mL is almost exactly 1.00 cc (cubic centimeter)

The volume = L X W X T so the thickness

T = volume / (L * W) = 0.5695 cc / (0.024 m * 2.4 X 10^4 um)

you should not have any problems converting cm, m and um into the same measure and doing the rest of the math.