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.
When we measure volume, we measure just how much space something takes up. Just as with length, our English system of measurement has many different units for volume, everything from ounces to barrels. The many units used to measure volume in the English system are all different, and they dont really relate to one another all that well.