This area would tell you the gallons that drained over that delta t. And this doesn't just apply when you have a constant, when you have a constant rate. If your rate looked something like this, as we've seen in other videos, as we've seen in other videos, you could figure out the amount that has drained, the amount that has drained in a specific interval, let's say this interval right over here, by essentially figuring out the area under the curve over that interval. And the units work out. If you multiply gallons per minute times minute, this area is going to be in terms of gallons. This area is going to be in terms of gallons. Another way you could think about it, and this goes back to, well, how do you figure out the area of a trapezoid right over here? Well, the area of a trapezoid, you could find the average height of the trapezoid, which would be the average of the beginning and the end period.