The correct height of tables and chairs should enable people to keep two basically vertical positions when sitting down: when the feet are flat on the ground, the thighs and legs can be basically vertical at this time, and the front edge of the seat can form pressure on the thigh plane; Secondly, when the arm droops naturally, the arm is basically vertical. When the height of the desktop is just in contact with the plane where the forearm is located, people can maintain the correct sitting and writing posture.
According to the regulations, the height difference between tables and chairs should be controlled between 280-320 mm, so a table with a height of 75 cm should be equipped with a stool with a height of 42-45 cm, and a chair with a height of 44 cm is the best choice.
Extended data:
Harm of inappropriate height of tables and chairs
If the tables and chairs are too low, it is easy for students to bend their spine forward or even hunchback. Long-term bowing will also affect lung development, lung ventilation function and cardiopulmonary function, resulting in small chest, small vital capacity, easy fatigue and weakened disease resistance. Similarly, the mismatch between the height of students and the height of desks and chairs will affect the distance between eyes and books, which will lead to myopia.
Poor sitting posture affects students' attention and memory, and makes them feel tired of learning. In addition to these, from the perspective of bone science, long-term, continuous and consistent behavior may lead to bone deformation. For example, the shoulders of people who often recite things will tilt, and the bones of people who write will be deformed, so long-term sitting posture will also have a bad influence on the shape of the spine.