 Okay, so we'll do this kind of density type problem that says a glass cylinder contains four separate liquid layers, mercury density 13.6 grams per mil, chloroform density 1.49 grams per mil, acetic acid density 1.05 grams per mil, and ether density 0.708 grams per mil. If a marble at density 3.05 grams per mil is added to the cylinder, where does it come to rest? Okay, so let's go ahead and draw a little cylinder and put these four liquids, these are all liquids, in order in the cylinder. So the one on the bottom is going to be the one with the highest density, okay? So which one is that? Mercury, right? So 13.6. So mercury is going to be down here at 13.6. Then what's going to be on top of the mercury? And we're just looking at these four substances here. So we've got that one. Next is going to be chloroform, right? So we'll put that, and we'll say chloroform is the checkered one there. And so we'll do this, the chloroform and the mercury. We'll do that. So what's next? Acetic acid. Acetic acid, okay? So that one's going to be like that, acetic acid. And then of course on the top is going to be ether, right? So we'll just leave that blank. So it wants to say, where does this marble come to rest? And it gives its density at 3.05 grams per mil. So we've got to look at these densities here. So it's going to go through the liquids that it has a higher density than, okay? So does it have a higher density than the top layer ether? Yes. Yes. 3.05 is higher than 0.708. Is that correct? Yes. Okay. So does it have a higher higher density than acetic acid? Yes. Yes. Does it have a higher layer, higher density than chloroform? Yes. Yes. Does it have a higher density than mercury? No. No. So where is the marble going to be found? It's going to be found right there. On top of the mercury layer, within the chloroform layer, okay? It's going to be sitting on the mercury layer there. Are there any questions about this one? It's a good kind of qualitative question.