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In Chemistry / High School | 2025-07-03

Which of the following particle analysis methods is used to measure the volume of particles?

A. Microscopy
B. Sedimentation
C. Coulter-counter
D. Sieving

Asked by teamdimples539

Answer (2)

The method used to measure the volume of particles is the Coulter-counter (option C). This device measures changes in electrical resistance as particles pass through an aperture, which allows for accurate volume calculations. Other methods listed do not directly measure particle volume.
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Answered by Anonymous | 2025-07-04

The question is about the methods used to measure the volume of particles, and among the options given, the correct choice is C. Coulter-counter .
The Coulter-counter is an instrument used to measure the size and volume of particles suspended in a fluid. It works based on the principle of electrical impedance: as particles pass through a small aperture, they displace their own volume of fluid, causing a measurable change in electrical resistance. This change in resistance is directly proportional to the volume of the particle, allowing the Coulter-counter to accurately determine the volume of each particle passing through the aperture.
Here is a step-by-step explanation of how the Coulter-counter works:

Suspension : Particles are suspended in an electrolyte solution.

Aperture : The suspension passes through a small opening or aperture.

Electrodes : Electrodes are placed on either side of the aperture to measure the electrical impedance.

Impedance Change : As each particle passes through the aperture, it displaces its own volume of the fluid, causing a temporary increase in resistance.

Volume Measurement : The change in resistance is converted into an electrical pulse proportional to the volume of the particle.

Data Recording : These electrical pulses are recorded and analyzed to provide a size distribution of the particles.


Coulter-counters are widely used in various fields such as biology, medicine, and engineering to analyze and monitor particle sizes in solutions.
Thus, among the options provided, the Coulter-counter is the tool specifically designed to measure particle volume accurately.

Answered by ElijahBenjaminCarter | 2025-07-06

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