18) Lab Essentials : Test tubes

Microbiology Lab Essentials : 

Glasswares :

18) Test tubes :

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 and closed at the bottom.

The 18 x 150 has been the standard size laboratory test tube for many years, although some modern labs are using smaller tubes to conserve reagents and generate less waste.

Inside Diameter : between 15.5 & 16.5 mm. 

Quantity : Test tubes, 25 x 150 mm, borosilicate glass.

It is a thin glass tube closed at one end, used to hold small amounts of material for laboratory testing or experiments.

In above image you can clearly obsereve the variety of capacity in volume give informatio  about volume of test tube.