Some stratification exists in the spray produced by any liquid propellant injector. 由任何液體推進噴注器所產生的噴霧都存在某些成層現象。
The application of a pressure difference across an injector does not cause an immediate velocity response of the liquid propellant. 經過噴注器的壓降發生變化時並不馬上引起液體推進劑速度變化。