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Could anyone tell us the difference between the Kotlin Flow api and Rxjava, is it a Kotlin implementation for the reactive extension or is it a different thing

Flow is a coroutines based cold asynchronous stream solution just as reactive streams. You can interop with RxJava2.

As far as I know there are a few operators implemented for Flow but not the whole reactive extensions specification

Flow isn’t implement reactive extension interfaces, but provides reactive extensions adapter

...which is what RxJava should have done and technically does

if I understands that clearly .. in Flow items will not be emitted unless there is a consumer .. but it also it hasn't the full RX interfaces .. but to maintain playing well with Rx there is an Adapter to be able to switching between flow and Rxjava for example

&gt; in Flow items will not be emitted unless there is a consumer 
Yes, but same as Rx

&gt; but to maintain playing well with Rx 
It's kinda abstract, adapter is just a function that creates Rx types or allows to convert Rx abstractions to coroutines