Quick Answer:The Kuhne’s Fermentation Tube is a borosilicate glass tube with a closed, graduated vertical arm and a bulb reservoir, used to collect and measure the carbon dioxide given off as yeast ferments sugar.
Last updated: 19 October 2026
Key Features
Borosilicate glass 3.3.
Closed-top graduated vertical tube joined to a bulb reservoir.
Permanent white enamel scale.
Broad glass foot so the tube stands on its own.
Technical Specifications
Specification
Value
Material
Borosilicate glass 3.3
Structure
Closed-top graduated tube with bulb reservoir
Graduation
Permanent white enamel scale
Base
Integrated broad glass foot
How It Is Used
A yeast and sugar mixture is poured in and the tube is tilted until the closed graduated arm is completely full, with no air at the top. As fermentation goes on, carbon dioxide collects at the top of the arm and pushes liquid down into the bulb, so the gas volume can be read off the scale. It is used to study anaerobic respiration in microbiology and biochemistry classes.
Frequently Asked Questions
How is the Kuhne’s Fermentation Tube filled?
Add the yeast-sugar mixture and tilt the tube until the graduated vertical arm is entirely filled with liquid, with no air bubble at the top.
