Orientation · Topic 1 of 3
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What is microfluidics?
The science of manipulating tiny volumes of fluid inside micrometre-scale channels.
What you’ll learn
- What “microfluidics” means and the length and volume scales involved
- What a microfluidic chip is and what it can contain
- Why shrinking a protocol onto a chip is useful
The concept
Microfluidics is the study and engineering of fluids in channels whose dimensions are on the order of micrometres — typically 1 to 1000 µm. At this scale the volumes involved shrink to microlitres, nanolitres, or even picolitres: a droplet thousands of times smaller than a raindrop.
A microfluidic “chip” routes these small volumes through networks of channels moulded or etched into glass, silicon, or a soft polymer such as PDMS. Pumps, valves, mixers, and sensors can be built at the same scale, so in principle an entire benchtop protocol can be shrunk onto a chip the size of a coin — the “lab-on-a-chip” idea.
The appeal is not only miniaturisation. Small volumes mean less reagent, faster heat and mass transfer, and many experiments running in parallel. And, as the next lessons show, the physics itself changes at the microscale in ways you can design around.
Why it matters
Using less sample and reagent per experiment cuts cost and makes precious samples — a single cell, one drop of blood — go much further.
Precise, repeatable control of tiny volumes is what makes modern diagnostics, drug screening, and single-cell biology possible.
Worked example
How little fluid is “microfluidic”? Take a channel 100 µm wide, 100 µm tall, and 1 cm long and work out its volume:
V = (100×10⁻⁶ m)(100×10⁻⁶ m)(1×10⁻² m) = 1×10⁻¹⁰ m³ ≈ 100 nL
That is about one ten-thousandth of a millilitre — roughly a thousandth of a typical raindrop.
Common mistakes
Watch out for:
- Assuming microfluidics just means “smaller pumps.” The behaviour of the fluid itself changes at this scale, so everyday plumbing intuition often fails.
- Confusing the channel dimensions (micrometres) with the device footprint (centimetres).
Keep going
Related tools
Further reading
- Introduction to Microfluidics — Patrick TabelingA standard, accessible introduction. Verify the current edition.
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What is microfluidics?
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Why the microscale behaves differently
Orientation
As channels shrink, viscosity and surface tension take over while inertia and gravity fade.
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Why the microscale behaves differently
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