9. shot (n.) a consecutive series of pictures that constitutes a unit of action in a film
The vacuum level is determined by the pressure differential between the evacuated volume and the surrounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury â usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg).
Intake manifold vacuum can be measured with a mechanical gauge, electronic pressure transducer, or through the engine management system via a diagnostic scan tool. Compared to consumer-grade instruments, a professional-quality mechanical vacuum is accurate, responsive and produces repeatable results.