00:01
Let's say we have a very large mass of aluminum, which is 1 .7 billion pounds, which we can convert to kilograms really quickly.
00:10
This is about 7 .71 times 10 to the 8th kilograms.
00:16
And we want to take this from an initial temperature of 20 degrees celsius to the melting point, which is 600 or sorry, which is, yeah, 660 degrees celsius.
00:28
So we want to know how much energy does this take.
00:30
And the heat capacity of aluminum, which we can write, it's about 900 joules per kilogram per degree c.
00:38
So the heat required, we'll call us delta q, is the mass times our heat capacity times our temperature change.
00:44
So our mass is 7 .71 times 10 to the 8 kilograms times 900.
00:51
And let's write this in kilojoules, actually...