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.
Volumes of Liquids. In this class, you'll most often measure the volume of a liquid using a graduated cylinder. There are other types of glassware that can measure volume but, for our purposes, graduated cylinders have enough precision as well as being relatively easy to use.