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A painless bite

Detailed studies of the mosquito’s injection system have enabled the development of painless hypodermic needles. This article describes the insect’s injection mechanism and how, using a simplified fluid-flow equation, the flow rate through such a needle can be calculated

The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.

The fluid flow rate in a hollow needle can be calculated using a simple model involving a fluid of constant viscosity.

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