固体因受热而引起线度变化的现象被称之为线膨胀.金属的温度变化不大时,其长度随温度的形变呈线性关系,我们称之为金属线性膨胀.在相同的条件下,不同的金属膨胀的程度不同,所以人们用金属线胀系数的大小来表示金属在受热时膨胀的程度.金属线性膨胀在生活中是容易被忽视的物理量,但是在生活中它扮演着不可忽略的角色,金属线性膨胀现象发生在各处,大到钢架结构的摩天大楼小到手机手表,这些都不可忽视金属的线性膨胀.为了让学生更好地理解和掌握这一物理 Solid due to heat caused by linear changes in the phenomenon known as linear expansion of the metal temperature is small, the length of the temperature with a linear relationship between the deformation, we call the metal linear expansion under the same conditions, different Of the degree of metal expansion, so people use the size of the metal linear expansion coefficient expresses the degree of expansion of the metal when heated.Metal linear expansion in life is easily overlooked physical quantity, but in life it plays a non-negligible role , Metal linear expansion occurs everywhere, up to the steel structure of the skyscraper small mobile phone watch, these are not to be ignored linear expansion of the metal.In order to enable students to better understand and master the physics