A one-dimensional linear array of liquid plugs separated by a gas phase is coalesced by (1) pumping the array through a conduit having a flow restriction of sufficient resistance or (2) a rapid and sudden increase in applied pressure (such as by increasing the flow rate). In this way, the flow of material through the conduit is restricted sufficiently to compress the gas phase into (partial or full) solubility within one or more components of the liquid phase.