Things You Should Know About Pycnometer

A pycnometer is a common science equipment found in laboratories. It is used to measure the density or rather volume of solids. It uses an inert gas such as helium or nitrogen. Hence, sometimes it is also known as helium pycnometer. A pycnometer can measure solids that are porous/non-porous, regularly shaped, granular, powdered, monolithic and even comminuted.

This laboratory equipment is based on Boyle’s Law which determines the volume-pressure relationship.

How is Pycnometer Useful?

A pycnometer makes the process of measurement simple and quick. It doesn’t require enough manpower to operate. It is also very affordable equipment.

What are Applications of a Pycnometer?

A pycnometer is used for characterizing:

  • Carbons
  • Metal powders
  • Ceramics
  • Heterogeneous catalysts
  • Petroleum coke
  • Cosmetics
  • Pharmaceutical ingredients
  • Cement
  • Other construction materials

It is also used to determine the density of viscous materials.

What are Different Types of Pycnometers?

There are broadly two types of pycnometers:

  • Gas Expansion Pycnometer
  • Also known as constant volume gas pycnometer, it comprises two chambers – sample and reference. A sample is put in the sealed chamber located in the pycnometer. Then, the pressure is applied as per the target measure. The readings are recorded. The opening of the expansion valve situated between the sample chamber and reference chamber let the gas expand to the reference chamber. This, in turn, creates a pressure drop ratio which verifies the density/volume of the said sample. It does so by comparing the recorded readings to the volume of a standard measured earlier through a similar process.

  • Variable Volume Pycnometer
  • Also known as gas comparison pycnometer, it consists of single or dual variable volume chambers. The cell volume for the sample can vary according to types and size. After the sample is placed in the sample chamber, a piston is placed at the initial position simultaneously. Then the valve is opened and gas is filled in pycnometer. The valve is closed after which the initial gas pressure in the pycnometer is measured using an absolute pressure transducer. The piston is moved to another position to measure the final pressure.

    A pycnometer is very important science laboratory equipment for scientific and many other types of research.

    Also Read: Tips on How to Choose Your Laboratory Equipments Wisely

    Related aticles

    reagent bottles
    02
    Dec
    This blog details a data-driven guide for Australian laboratories on choosing high-quality reagent bottles. Covering essential features, safety compliance, and advanced materials like borosilicate glass, readers will understand the importance of investing in durable and reliable labware.
    earth science kits
    29
    Nov
    This blog highlights how earth science tools and equipment, like geology kits, engage students in interactive activities such as rock identification and fossil excavation. Learn how these kits promote critical thinking, problem-solving, and collaboration, while helping students visualise complex Earth science concepts like plate tectonics, erosion, and the rock cycle. Perfect for enhancing STEM education and fostering a deeper understanding of Earth and space science
    distillation kit
    27
    Nov
    Selecting the right distillation kit is crucial for lab efficiency and accuracy. This blog explores the common mistakes labs make, such as choosing the wrong size, ignoring material compatibility, and overlooking maintenance needs. Learn how investing in high-quality, reliable equipment can prevent costly errors and ensure successful outcomes.
    bunsen burners
    25
    Nov
    This article provides a comprehensive look at the Bunsen burner, a fundamental tool in any chemistry laboratory. From heating substances and conducting flame tests to sterilising lab equipment, the Bunsen burner serves a range of essential purposes. Alongside its primary uses, we cover important safety precautions to ensure safe handling and operation in lab environments. Ideal for students, educators, and lab professionals, this guide offers both practical insights and a clear understanding of safety protocols.