物理估算 ,一般是指依据一定的物理概念和规律 ,运用物理方法和近似计算方法 ,对所求物理量的数量级或物理量的取值范围 ,进行大致的推算 .物理估算题和常规计算题的解题步骤虽然相似 ,但有其自身特点 ,其文句简洁、条件隐蔽 ,常使学生感到无从下手 ,因此 ,掌握其解题要领尤为 Physical estimation generally refers to the use of physical methods and approximate calculation methods according to certain physical concepts and laws, to roughly estimate the range of quantities or physical quantities of physical quantities sought, and to solve problems of physical and conventional calculation problems. Although the steps are similar, they have their own characteristics. Their sentences are concise and the conditions are hidden. They often make students feel unable to start. Therefore, it is especially important to grasp the key points for solving problems.