The metric or SI (Le SystÃ¨me International d'UnitÃ©s) system of units has many derived units from the seven base units. A derived unit would be a unit that is a combination of base units. Density would be an example where density = mass/volume or kg/m3. Many derived units have special names for the properties or measurements they represent. This table lists eighteen of these specialized units along with their basic unit factors.
Cadence (cycling) In cycling, cadence (or pedalling rate) is the number of revolutions of the crank per minute; this is the rate at which a cyclist is pedalling/turning the pedals. Cadence is directly proportional to wheel speed, but is a distinct measurement and changes with gearingâwhich determines the ratio of crank rpm to wheel rpm.
Seventy to 100 revolutions per minute is an ideal cadence for most cyclists. Riding a bike over short distances is simple and relaxing, but when you start putting many miles under your wheels or climbing steep hills it can be a tough workout. Maintaining an ideal pedaling speed helps to counteract the rigors of a long ride on your body. Cyclists refer to their pedaling speed as cadence.