Test tubes are widely used by chemists to hold, mix, or heat small quantities of solid or liquid chemicals, especially for qualitative experiments and assays.
Their round bottom and straight sides minimize mass loss when pouring, make them easier to clean, and allow convenient monitoring of the contents.
A test tube, also known as a
culture tube or sample tube, is a common piece of laboratory glassware
consisting of a finger-like length of glass or clear plastic tubing, open at
the top, usually with a rounded U-shaped bottom.