Foot Drop Causes. Generally speaking, the causes of foot drop are weakness or paralysis of the muscles needed to lift the foot. More specifically, the condition is most often caused by compression of the peroneal nerve that controls the anterior tibialis, or the muscles that lift the foot.
Measurement Definition. In science, a measurement is collection of quantitative or numerical data that describes a property of an object or event. A measurement is made by comparing a quantity with a standard unit.
Performing a measurement means comparing an unknown physical (or chemical) quantity with a quantity of the same type taken as reference using an instrument. A measurement necessarily involves a reference frame and therefore units. In the not so distant past, there were numerous units, which had little in common with each other. The first coherent system of units only appeared with the French revolution: the metric system.