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在引导学生进行用注射器“估测大气压强的值”实验时,发现每个学生小组测出的大气压强值都只有标准大气压的一半左右,再次实验仍然如此,这显然不能用’误差是难以避免的’来解释了.经过仔细的分析和实验验证,发现苏科版8年级物理(下)教科书,第十章《压强和浮力》第三节〈气体的压强〉,活动10.7中“估测大气压强的值”的实验方法有明显的欠妥之处.教材中的实验步骤是这样的:第1步,把注射器的活塞
In guiding students to experiment with syringes to estimate the value of barometric pressure, it was found that each group of students measured atmospheric pressure values of only about half of the standard atmospheric pressure. Again, the experiment is still the case, which obviously can not be used ’error is Difficult to avoid ’to explain.After careful analysis and experimental verification, we found Suke eighth grade Physics (the second) textbook, the tenth chapter “pressure and buoyancy” the third section " The experimental method for estimating the value of atmospheric pressure has obvious defects. The experimental steps in the textbook are as follows: Step 1: Place the syringe’s piston