试管是一种实验室玻璃器皿。

是由玻璃构成的如同手指形状的管子，顶端开口，通常是光滑的，底部呈"U"形。

试管的长度从几厘米到20厘米不等，直径在几毫米到数厘米之间。

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.

A large test tube specifically for boiling liquids is called a boiling tube.