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Test tubes are finger-like device with an open top end and a U-shaped bottom. Normally, the device is used to serve the purpose of holding, mixing, or heating small quantities of solid or liquid chemicals, especially for qualitative experiments in a laboratory.
Test tubes come in various sizes to cater to different types of requirements in a scientific laboratory. Plastic test tubes are generally made of polystyrene, which offers glass-like clarity and prevent breakages associated with glass test tubes.