Length is a measure of one-dimensional space and the distance from point to point. Usually, when measuring the side length of a line segment in two-dimensional space, the one with a large length value is called long, which is neither greater than its value nor wider than the side length. So width is actually a measure of length, so the height of "vertical length" is measured in three-dimensional space.

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Length measurement

The measurement of length is the most basic measurement, and the most commonly used tool is the scale. Please note when using:

1. The ruler should be placed along the measured length, and the edge of the ruler should be aligned with the measured object. It must be placed in the right position and cannot be skewed.

2. Don't use worn zero scale lines. If another whole scale line is used as the zero scale line due to the wear of the zero scale line, don't forget to subtract the scale value of the replacement zero scale line from the final reading.

3. The thick ruler should be placed vertically.

4, reading, the line of sight should be perpendicular to the ruler.