在“真空”状态下进行实验,在小学科学或自然教材中出现了多次。如《金属生锈》一课,对比铁钉在油和水中、有空气和无空气(真空)状态下哪个最先生锈;最明显的是《声音的传播》一课,要让学生们相信在真空状态下声音无法传播,这是了解声音传播特点的关键。但在教参中常介绍用抽气 Experiments in a “vacuum” state have occurred many times in primary science or nature textbooks. Such as “rusty metal” lesson, comparing iron nails in the oil and water, with air and no air (vacuum) which rustiest first; the most obvious is the “spread of sound” lesson, to make students believe in Sound can not be transmitted under vacuum, which is the key to understanding the characteristics of sound transmission. However, often introduced in the teaching parameters with suction