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).
Operating Vacuum. Because atmospheric and intake manifold pressures begin to equalize as the driver opens the throttle plate, intake manifold vacuum is normally measured at idle speed. At wide-open throttle (WOT), atmospheric and manifold pressures become nearly equal as air rushes in to fill the engineâs cylinders.