What's visible with the naked eye, weightless and if you put it in a bucket,!

Question:

What's visible with the naked eye, weightless and if you put it in a bucket, it makes the bucket weigh less?

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10 points to whoever gets this first.

Answers: A hole... A hole

[Edit] - Oooh missed out by five seconds.. a hole saw this question a few weeks ago and couldnt figure it out thank you i now know lol hole this is so old...hhmph.... A hole Man, that one was easy. a hole? maybe around the size of a bullet. hole hole

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