2.inch (abbreviated as in) in Dutch means thumb, and one inch is the width of ordinary people's thumb at the bottom of nails. The unit of length refers to the basic unit for measuring spatial distance, which is formulated by human beings to standardize the length.
In the 3rd century and 65438+4th century, King Edward II of England promulgated the "standard legal inch". It is stipulated that the three largest wheat grains should be selected from the middle of the barley ear and arranged in a row one inch in length.
4. In tablet computers, the screen sizes are usually 7.9 inches, 9.7 inches and 12.9 inches. The size of the display screen is usually measured by the diagonal length in inches.