Bolt tensioners are devices designed to apply a specific tension to a bolt. The device may be either removed once the actual nut is threaded into place, or left in place, in the case of a hydraulic nut.
The metric system does away with all of the different units of volume used in the English system, and instead, uses only one unit to measure volume. That unit is called the liter. Materials Needed: Meter stick or metric ruler; stiff cardboard such as poster board; scissors or hobby knife; tape.
In precise work it is never safe to assume that the volume delivered by or contained in any. volumetric instrument is exactly the amount indicated by the calibration mark. Instead, recalibration is usually performed by weighing the amount of water delivered by or contained in. the volumetric apparatus.