For the height of tables and chairs, the state has formulated standards. Among them, the standard height of desktop furniture can be 700 mm, 720 mm, 740 mm and 760 mm; The chair height of bench furniture has three specifications: 400mm, 420mm and 440 mm. In addition, the standard size of tables and chairs is stipulated, and the height difference between tables and chairs should be controlled within the range of 280 to 320 mm

The correct height of tables and chairs should be that they can keep two verticals when sitting. One is that when the feet are placed on the floor, the thighs and calves can be basically vertical, and then the seat at the front edge can't exert pressure on the plane of the lower thigh. Second, when the arm naturally goes down, the upper part of the arm is basically perpendicular to the lower part of the arm, and the height of the table should just touch the lower plane of the lower part of the arm. This can make people keep the correct sitting posture and writing posture. If the height of tables and chairs is unreasonable, it will directly affect the posture of the sitting person, which is not conducive to the health of users. In addition, the space below the writing board is not less than 580mm, and the space width is not less than 520 mm. ..