https://blog.gongquiz.com/2022/12/01/%ec%a4%91%eb%9f%89%ec%9d%b4-2500kgf-%eb%82%a0%ea%b0%9c%eb%a9%b4%ec%a0%81%ec%9d%b4-10m2-%ec%b5%9c%eb%8c%80-%ec%96%91%eb%a0%a5%ea%b3%84%ec%88%98%ea%b0%80-1-6%ec%9d%b8-%ed%95%ad%ea%b3%b5%ea%b8%b0/