Vacuum
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A vacuum is a region in space devoid of all types of matter, such as atoms and molecules. Such a region does not transmit sound waves or conduct heat, although heat can travel through it via radiation. Vacuums have important uses for science and technology.
While a perfect vacuum is theoretically possible, it has never been replicated in the lab. Pascal was the first person to prove the existence of a vacuum.
Source
The New American Desk Encyclopedia, Penguin Group, 1989