论文部分内容阅读
“物质密度表”(初中《物理》第一册83页)中可以看到,水的密度ρ水=1.0×10~3千克/米~3大于冰的密度ρ冰=0.9×10~3千克/米~3。由此可知,相同质量的水在降低温度到结冰后,体积要膨胀。冰和水都是由同种物质组成,奇怪的是水在结冰的过程中,为什么与绝大多数物质热胀冷缩的规律相反呢?初中《物理》第二册第60页又提到水的反常膨胀,也就是说水在4℃对(严格说应该是3.98℃)密度最大,这是什么道理呢?为了说明上述两个问题,从查阅有关的资料可
As can be seen from the “Physical Density Chart” (Junior High School Physics, Volume I, p. 83), the density of water ρ water = 1.0 × 10 -3 kg / m 3 is greater than that of ice ρ Ice = 0.9 × 10 ~ 3 kg / m ~ 3. It can be seen, the same quality of water in reducing the temperature to ice, the volume to be expanded. Ice and water are composed of the same kind of material, strangely why water in the process of freezing, why most of the material contrary to the law of thermal expansion and contraction? Middle School “Physics” Volume II page 60 also mentioned The abnormal expansion of water, that is to say the maximum density of water at 4 ° C (strictly speaking it should be 3.98 ° C). What is the point? To illustrate the above two issues,