Modified or damaged coins have no collector value.
Nothing. Modified coins have no collector value.
No circulating Australian coin has ever been minted that includes a hole in the design. If your coins have holes in them, somebody put them there so that the coins could be worn as a pendant or similar.
A mouse can get through a hole the size of a ball point pen (7mm) . A shrew is smaller so can probably get through a hole of 4-7mm. I think small rodents can compress their skulls to squeeze through amazingly small gaps.
The movement of gas through a small hole into an area of lower pressure is diffusion.
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Through a small hole in the base.
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Make a small hole in a window cover and look at the opposite wall. ... when some of the rays reflected from a bright subject pass through a small hole in ... the creation of an inverted image formed by light rays passing through a pinhole.
Gases are able to flow through a small hole because of diffusion. This is the process by which the rapidly moving molecules move apart through the collision with other molecules.