00:01
Okay, so here we have the maximum concentration of lead is 15 parts per billion, and we have the concentration in grams per kilogram of solution, and the solution here is water, so we want to convert this into units of parts per billion, which is micrograms per liter.
00:24
So what we need to do is we need to convert grams into micrograms, and we need to convert kilograms into liters.
00:32
So we know the density of water is 1 gram per cubic centimeter.
00:45
And we also know that one cubic centimeter is equal to 1 milliliter.
00:50
So this is one way that we can get from kilograms into volume, or from mass into volume.
00:57
So we can convert kilograms into grams, so we can use this conversion factor to convert between mass and volume.
01:04
And then we can continue on and convert this into the proper units to get to the unit of liters, which is what we want to get into units of parts per billion.
01:14
So to convert kilograms into grams, we know one kilogram is equal to a thousand grams, and that's just a metric conversion.
01:22
So that cancels out kilograms...