Types of Test Tubes

Each type of test tube has a specific purpose.

Test tubes are used in laboratories and research facilities. Usually made from glass, they vary in shape and size depending on their intended purpose. Test tubes can be used to grow plants, hatch insects and store samples. They can withstand heating and refrigerating, making them ideal for many science experiments.

Standard Test Tube

The most common style of test tube is the glass or Pyrex tube measuring 18 x 150 mm (3/4 x 6 inches). Each tube has the capacity to hold 25 ml (1 oz.).

Erlenmeyer Flask

An Erlenmeyer flask with a plant growing inside.

An Erlenmeyer flask is wider on the bottom than the top. The name is derived from the chemist who invented it, Richard Erlenmeyer. The design allows it to heat up liquids faster. It usually has measurements marked on the side so liquids poured in can be easily measured.

Florence Flask

Florence flask.

A Florence flask is similar to an Erlenmeyer flask, except it has a round bottom instead of a flat bottom. The bulb shape is better for heating a substance quickly.

Graduated Cylinder

Graduated cylinder.

A graduated cylinder measures small amounts of liquid. They are usually made of glass or plastic.

Thistle Tube

According to Thomasnet.com, thistle tubes "allow chemists to add material through a semi-permeable membrane or specially designed stopper....Thistle tubes are specifically designed to fit in complementary stoppers on Erlenmeyer and other flasks, so that new materials can be introduced to other compositions."

Volumetric Flask

A volumetric flask measures a set volume. The standard volumes it contains are a liter or half liter.

Beaker

A beaker partially filled with fluid.

A beaker serves as a multipurpose lab container. It measures, stores, heats, cools or holds substances.

References

• ThomasNet: Laboratory Glassware: Types of Laboratory Tubes
• Cartage.org: Lab Equipment
• University of Colorado at Boulder: Bench Glassware