Question

Quantities or measured properties that are capable of changing values are called

Answer 1

I would say that for quantities or measured properties that are capable of changing values are called parameters. For example, with a transmission to shift to a lower gear the speed would have to be within certain parameters to allow the shift to take place.

Answer 2

Measured properties that are capable of changing values are called VARIABLES. 
Variables are data values that may assume more than one value, that is, they are capable of changing. There are different types of variables; in scientific experiments for instance, there are three types of recognized variables, these are: dependent, independent and controlled variables.