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).
The Core: Vacuum Unit. 1  Filtration. Disposable or permanent filters. 2  Power. 110 or 240 volt. Units available for every size home. 3  Quality. Metal or plastic, name brand components or not. 4  Sound. Ranges from loud to conversational noise level.