Over 30 m length of a 150 id mm vacuum line carrying air at 293 k, the pressure falls from 1 kpa to o.1 kpa. if the relative roughness of the pipe is 0.002, what is the approximate volumetric flow rate in the pipe (in m3/s measured at the mean pressure in the system)?

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

the answer is c i took the test

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.