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案例展示:实验课,测量食盐水的密度,要求小组讨论测量方案及步骤,约3分钟后汇报。学生的答案如下:方案一:①用量筒测出部分食盐水体积为V;②用天平测空小烧杯质量为m1;③再测出烧杯与盐水的总质量为m2;④利用公式计算。方案二:①用天平测出空小烧杯质量为m1;②再测出烧杯与适量盐水的总质量为m2;③再将食盐水倒入量筒中,测出体积为V;④利用公式计算。
Case Presentation: The experimental class, which measures the density of saline, requires the panel to discuss measurement protocols and procedures and report about 3 minutes later. Student’s answer is as follows: Option one: ① measuring cylinder to measure the volume of salt water V; ② using a balance to measure the small beaker mass m1; ③ measured the total mass of beaker and brine m2; ④ using the formula. Solution II: ① using a balance to measure the small beaker mass m1; ② measured the total mass of beaker and the amount of salt for the m2; ③ then salt water into the cylinder, measuring the volume V; ④ calculated using the formula.