Barter is the present and the future of international trade, especially for people who is starting in the import export business. Barter and more: Triangular operations.
Laboratory instruments for separating substance
Funnel: Divided into ordinary funnel, long-necked funnel, and separatory funnel. Ordinary funnels are used to filter or transfer liquids to small-mouth containers. A long-necked funnel is used to inject liquid into other generating devices. The separatory funnel is used to classify different liquids with different densities and incompatibilities. It can also be used to add liquid to the reactor at any time for extraction and separation. The funnel is tapered and has an elongated tube. At this time, the test tube brush laboratory apparatus uses to clean small pipes in addition to the conical part. Two test tube brushes can be used.