It is weightless, you can see it. If you put it in a barrel it will make it lighter?

Answer: Hole

More Difficult Riddles with answers

More Difficult Riddles

It is worldwide, but once only a spider could weave one
It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?
It stands upright and can be quite grand. Its secret is not hidden but right at hand. What is it?
It's a game played by serious people that takes place on a global scale.
It's anything but amusing when this body part gets hit.
It's been around for millions of years, but is never more than a month old. What is it?
It's equally comfortable in an orchestra and a geometry textbook. What is it?
It's got twists and turns, but has no curves. Twist it to fix it, turn it to ruin it. What is it?
It's the only vegetable or fruit that is never sold frozen, canned, processed, cooked, or in any other form but fresh
It's usually found dried, but often kept slicker. Above another need, it's said to be thicker. What is it?
Its title means book.
John's father has three sons. Two of them are Tom and Paul what is third son name? riddle answer