The meaning of the word ‘vacuum’ is ‘emptiness’. i.e., a space without any matter. So in vacuum, the space will have no air and other gases. Usually vacuum means a space where pressure is less than 760 Torr. How to generate vacuum? One way is just similar to the suction in an ordinary drinking straw. Here we reduce the pressure on the liquid surface inner region of straw relative to the pressure above the liquid in the drinking cup. The extra pressure which is responsible for pushing the liquid into the straw to reach the liquid in our mouth. The boiling temperature of any liquid becomes reduced at vacuum. Electrical discharge phenomena of gases lead to the discovery of electrons and X-rays. For this vacuum condition is a must and that is the importance of vauum science in the technological area.
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