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A '''vacuum''' is any region in space devoid of [[atom]]s and [[molecule]]s.  Such a region does not conduct heat (although heat can travel through it by [[radiation]]) or transmit sound waves and has important uses for both science and technology.

A '''vacuum''' is a region in space devoid of all types of [[matter]], such as [[atom]]s and [[molecule]]s.  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.  [[Blaise Pascal|Pascal]] was the first person to prove the existence of a vacuum.

While a perfect vacuum is theoretically possible, it has never been replicated in the lab.  [[Blaise Pascal|Pascal]] was the first person to prove the existence of a vacuum.