“零”在物理中,常常反映出一定的物理意义,这与教学中的“零”有着本质的区别,本文就“零”在物理中的意义举例说明如下. “零”不等于“没有”在物理中,“零”有时反映某个物理量的真实存在。例如,某物体的温度是“零”摄氏度,不能认为这个物体“没有”温度;贮气筒上的气压指示为“零”时,并不表示筒内压强是零,而是反映筒内尚有一个大气压的气体。反映测量工具的最小分度从数学的角度去看,小数点后面的零是没有意义的。但在物理中,比如用刻度尺测量物体的长度时,测量值后面的“零”,除了近似 “Zero” often reflects a certain physical meaning in physics, which is essentially different from “Zero” in teaching. This article exemplifies the meaning of “Zero” in physics as follows. “Zero” does not mean “No”. In physics, “zero” sometimes reflects the real existence of a physical quantity. For example, if the temperature of an object is “zero” degrees Celsius, the object cannot be considered as “no” temperature. When the air pressure indicator on the air reservoir is “zero”, it does not mean that the pressure in the cylinder is zero, but there is still one in the cylinder. Atmospheric pressure gas. Reflecting the minimum graduation of the measurement tool From the mathematical point of view, the zero behind the decimal point is meaningless. But in physics, for example, when measuring the length of an object with a scale, the “zero” behind the measured value, except for the approximation