Named after Giovanni Battista Venturi (1746–1822), Italian physicist, it is a system for speeding the flow of the fluid, by constricting it in a cone-shaped tube. The gas is drawn into the throat of the venturi by a stream of absorbing liquid. These devices are generally used when a low pressure drop is required and where the liquid contains suspended solids, which would otherwise plug the packed or tray towers. This can be used in a single stage countercurrent mode or multistage countercurrent mode by using several venturis. JRF has the capability to design and manufacture single stage and multistage venturis.