The meaning of the word, ‘vacuum’ is complete emptiness. Thus we can conclude that vacuum means space in which air and other gases are absent. Technically vacuum is significant only when the gas pressure becomes less than 760 torr. The most common example of creating vacuum is the suction in an ordinary drinking straw. Many devices require vacuum conditions for their operations. In dewar flask, television tube, electric bulb, vacuum cleaner etc. we use vacuum conditions. The boiling temperature of a liquid is reduced in vacuum. Transmission of sound is difficult through a region having high degree of vacuum. The advance in technology is also due to vacuum technology. X-ray technology, microelectronic technology, computer technology, metallurgical advances etc. are mainly due to vacuum technology.
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