What is test tube? How to use in English

The word "test tube" refers to a small glass or plastic tube with a narrow cylindrical shape, which is used in scientific experiments to hold and contain liquids or gases for chemical reactions or observations. The term "test tube" is attributed to its historical use in medical testing during the late 1800s. At the time, doctors were experimenting with various substances to test their effectiveness against diseases. These tests were often conducted on live patients, which was not only inhumane but also posed serious health risks. To avoid these issues, scientists started testing their solutions on animals, which led to the use of test tubes as an alternative way of testing substances. The first test tubes were made of glass and had a standard length of about 20 centimeters and a diameter of 1 to 2 centimeters. They were designed to be connected to other glassware, making them a versatile tool in medical and scientific experiments. The name "test tube" comes from their use in chemical testing for medical diagnosis, as "test" refers to the testing process, and "tube" refers to the glass container used to hold the solution being tested. In summary, the origin of the word "test tube" can be traced back to the late 1800s, when they were first used in medical testing as a humane and safer alternative to human trials. The name "test tube" reflects their use in testing substances and is attributed to the standard shape and size of the glass container used in scientific experiments.