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==Historical Background==
==Historical Background==
In the 17th century air pumps were developed and used by travelling scientists who commonly demonstarted formation of vacuum by withdrawing air from flask (glass bell jar) containing an animal such as bird who then deprived of oxygen started to suffocate as reflected in famous painting by J.Wright of Derby.<ref>{{cite web
In the 17th century air pumps were developed and used by travelling scientists who commonly demonstarted formation of vacuum by withdrawing air from flask (glass bell jar) containing an animal such as bird which then deprived of oxygen started to suffocate as reflected in famous painting by J.Wright of Derby.<ref>{{cite web
|title=An Experiment on a Bird in the Air Pump
|title=An Experiment on a Bird in the Air Pump
|author= Joseph Wright of Derby
|author= Joseph Wright of Derby