Measurement of length:
1. The measurement of length is the most basic measurement in physics and a basic skill for scientific inquiry. A common tool for measuring length is a scale.
2. In the International System of Units, the main unit of length is m. Commonly used units are kilometers (km), decimeters (dm), centimeters (cm), millimeters (mm), and micrometers (μm). , nanometer (nm).
3. Conversion relationship between main unit and common unit:
1 km=103m 1m=10dm 1dm=10cm 1cm=10mm 1mm=103μm 1m=106μm 1m=109nm 1μm=103nm
The process of unit conversion: formula: "The coefficient remains unchanged, and the equivalent value is substituted."
4. Length estimation: blackboard length 2.5m, desk height 0.7m, basketball diameter 24cm, fingernail width 1cm, pencil lead diameter 1mm, length of a new pencil 1.75dm, palm width 1dm, ink bottle height 6cm
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