Video Transcript
The density of gold is 19,320
kilograms per cubic meter. What is this value in grams per
cubic centimeter?
In order to answer this question,
we need to work out how we can convert from kilograms per cubic meter to grams per
cubic centimeter. We know that there are 1,000 grams
in one kilogram. This means that in order to convert
from kilograms to grams, we need to multiply by 1,000. There are 100 centimeters in one
meter. In this question, we are dealing
with cubic meters, the units of volume. Cubing 100 gives us one
million. Therefore, there are one million
cubic centimeters in one cubic meter. This means that to convert from
cubic meters to cubic centimeters, we multiply by one million.
We can use this information to work
out how we would convert from kilograms per meter cubed to grams per centimeter
cubed. We need to multiply the numerator
by 1,000 and the denominator by one million. Let’s consider the fraction 1,000
over one million. We can divide the numerator and
denominator by 1,000, which gives us one over 1,000. This means that to convert from
kilograms per meter cubed to grams per centimeter cubed, we need to multiply by one
one thousandth. This is the same as dividing by
1,000.
We need to divide 19,320 by
1,000. Dividing by 1,000 moves all of our
digits three places to the right. This means that the density of
19,320 kilograms per cubic meter is the same as 19.32 grams per cubic
centimeter. The density of gold in grams per
cubic centimeter is 19.32.
To convert between the two
different units of density, we can divide or multiply by 1,000. To go from kilograms per cubic
meter to grams per cubic centimeter, we divide by 1,000. And to go the other way, we
multiply by 1,000.
