Прочитайте текст и выполните задания. Vacuum 1. Evangelista Torricelli produced the first laboratory vacuum in 1643, and other experimental techniques were developed as a result of his theories of atmospheric pressure. A torricellian vacuum is created by filling a tall glass container closed at one end with mercury and then inverting the container into a bowl to contain the mercury. 2. The quality of a vacuum refers to how closely it approaches a perfect vacuum. Residual gas pressure is a primary indicator of quality, and is most commonly measured in units called torr, even in metric contexts. Lower pressures indicate higher quality, although other variables must also be taken into account. 3. Vacuum became a valuable industrial tool in the 20th century with the introduction of incandescent light bulbs and vacuum tubes, and a wide array of vacuum technology has since become available. The recent development of human spaceflight has raised interest in the impact of vacuum on human health, and on life forms in general. Завершите утверждение согласно содержанию текста. A great variety of vacuum technologies have become possible …
because people wanted to use the quality of a vacuum in industry
due to invention of laboratory vacuum by Evangelista Torricelli in 1643
due to the recent development of human spaceflight
when incandescent light bulbs and vacuum tubes began to be applied in industry
