Ratio between two sets of measurements?

Oh, dude, the ratio between two sets of measurements is just a way to compare the sizes of things. It's like looking at how many times one thing fits into another. So, if you have, like, 5 Apples and 2 Oranges, the ratio of Apples to oranges would be 5:2. It's just a fancy math term for saying "this many of this, that many of that."