Test tube
Test tube
A test tube (/ˈtɛst ˌtjuːb/) is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom.
Etymology
The term "test tube" comes from the Latin word testum meaning "the shell of an egg, a pot, a tile". It was first used in the 1840s.
Usage
Test tubes are used by chemists in the lab to hold, mix, or heat small quantities of liquid or solid 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.
Related Terms
- Test tube rack: A piece of laboratory equipment used to hold upright multiple test tubes at the same time. It is most commonly used when various different solutions are needed to work with simultaneously, for safety reasons, for safe storage of test tubes, and convenience.
- Test tube baby: A term used to refer to a baby conceived through in vitro fertilization (IVF). This process involves fertilizing an egg outside the body in a laboratory dish and then implanting it in a woman's uterus.
- Test tube brush: A type of brush used for cleaning test tubes and narrow mouth laboratory glassware, such as graduated cylinders, burettes, and Erlenmeyer flasks.
- Test tube holder: A piece of laboratory equipment used to safely hold and transport test tubes during experiments or while examining the contents.
External links
- Medical encyclopedia article on Test tube
- Wikipedia's article - Test tube
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