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实验材料:五个玻璃瓶、百洁丝、盐、标签、水、抹布。实验步骤:在五个瓶子里各放入一团百洁丝。给第一个瓶子贴上写有“(a)百洁丝+空气”的标签。在第二个瓶子里,把湿抹布放在百洁丝下面,然后贴上写有“(b)百洁丝+空气+水”的标签。在第三个瓶子里加一些自来水和一小撮盐,贴上写有“(c)百洁丝+空气+水+盐”的标签。在第四个瓶子里倒满烧开的水,把盖子盖好,贴上写有“(d)百洁丝+水”的标签。往第五个瓶子里倒入半瓶自来水,贴上写有“(e)百洁丝+空气+水”的标签。一个星期后,观察每个瓶子里所发生的变化。
Experimental Materials: Five glass bottles, Scouring wire, salt, labels, water, rags. Experimental steps: Put a group of 100 cleansing in each of the five bottles. Label the first bottle with “(a) Paella + Air”. In the second bottle, place a damp cloth under the gauze and label it with “(b) Paella + Air + Water”. Add tap water and a pinch of salt to the third bottle and label with “(c) Paella + Air + Water + Salt”. Fill boiled water in the fourth bottle, cover the lid and label with “(d) Scotch + water”. Pour half a bottle of running water into the fifth bottle and label with “(e) Paella + Air + Water”. After a week, observe what happens in each bottle.