How are units of measurement related to one another? - Answers

The SI system has seven basic units which are essentially independent of one another. These aremetre : lengthkilogram : masssecond : timeampere : electric currentkelvin : thermodynamic temperaturemole : amount of substancecandela : luminous intensity.The unit for velocity is a metre/second. So momentum is kilogram*(metre/second). The unit for force (Newton), the rate of change of momentum, is kilogram*metre/second2. Pressure is measured as force per unit area and so its measurement unit is kilogram/(metre*second2). Each derived unit is defined in terms of these basic units.It is, of course, possible to replace one of the basic units by something else - for example a fundamental constant. For example, the measure of length could be replaced by the speed of light in vacuum, c, and then length would be a derived unit: metre = c*second. Several such sets have been suggested: to learn more go to //en.wikipedia.org/wiki/Natural_units