Questions about the linear expansion coefficient of metals in GB/T20801-2020?
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The linear expansion coefficient of metals is generally the average linear expansion coefficient between the design temperature and 20°C. However, in GB/T20801.2-2020, there are values for the coefficient of thermal expansion at 20°C. How should this be understood here? What do everyone think of this figure?
At 20°C, the expansion amount is 0, but the coefficient of expansion cannot be 0.