F l u x = F l o w o f a q u a n t i t y / T i m e A r e a = F l o w r a t e A r e a {\displaystyle \mathbf {Flux} ={\frac {\mathbf {Flow\;of\;a\;quantity/Time} }{\mathbf {Area} }}={\frac {\mathbf {Flow\;rate} }{\mathbf {Area} }}}