vacuum range การใช้

The difference between the vacuum range and actual range is known as the " trail ", because the bomb appears to trail behind the aircraft as it falls.
If the bomb was not subject to drag, its path would be purely ballistic and it would impact at an easily calculable point, the " vacuum range ".
In practice, drag means that the impact point is short of the vacuum range, and this real-world distance between dropping and impact is known simply as the " range ".
Although its use has been mainly associated within the high-vacuum range ( down to 10 " 9 mbar ), diffusion pumps today can produce pressures approaching 10 " 10 mbar when properly used with modern fluids and accessories.
The features that make the diffusion pump attractive for high and ultra-high vacuum use are its high pumping speed for all gases and low cost per unit pumping speed when compared with other types of pump used in the same vacuum range.