Dear friends in the printing industry, what is the standard of the height of words on printed matter now?

The characters on printed matter are based on the standardized characters in the National Standard for Common Languages and Characters, that is, orthographic characters. Generally, the orthographic character on printed matter is the fifth Chinese character, just like the font size in students' textbooks. The state has clear standards for the wording of some magazines, books and textbooks, in order to facilitate reading and beauty. The packaging and instructions of general products are designed and printed according to the requirements of customers. There are no clear rules and standards, as long as it can reflect the requirements of the product, it should be elegant and easy to read and see. This is entirely based on the requirements of the designer.