Okay, this seems like a totally newbee question, but it comes down to the fact I just never used them before. And I HAVE Googled it, I'm just finding an answer there.

What does an Olympic dumbbell weigh? I know what the barbell weighs, but am just not finding the information for the dumbells.

See, I can use the gym at work and this is what they have. As I'm working out alone, in the middle of the night, I am using dumbbells for most of my work. And while I can see progress in what I'm adding, I'm rather wondering what it is I'm actually lifting, you know?

So, if anyone can give me an answer, and I'm sure someone knows here, I'd be very grateful. Thanks!