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Chapter 2: Measurement II
1. Why This Matters
Imagine you are an engineer designing a heart valve. It must be exactly 22.5 millimetres wide. Not 22.6. Not 22.4. If it is wrong, a life could be lost. Or imagine you are a jeweller measuring a diamond. A fraction of a millimetre changes its value dramatically. Or imagine you are a scientist measuring the width of a human hair — just 0.07 mm. A metre rule cannot do this. You need finer tools.
In this chapter, we go beyond the basics. We will le
