A vacuum is defined as a space devoid of matter or one containing matter at an extremely low density. While a perfect vacuum is a theoretical concept in classical physics, all measurable vacuums contain residual particles, electromagnetic fields, and quantum fluctuations. In applied science, vacuum technology involves creating and maintaining controlled low-pressure environments, ranging from moderate vacuum levels to ultra-high vacuum (UHV). These controlled conditions are essential in various fields, including the testing of advanced materials, the operation of particle accelerators, and the maintenance of sensitive scientific instruments where atmospheric interference must be eliminated for accurate measurement.