“水的沸腾”实验中4个问题的分析及改进

Analysis and improvement on water boiling experiment

对水的沸腾实验进行改进,用大试管盛80℃左右的热水做沸腾实验,气泡量明显增加,而且气泡上升的距离长.改进后实验用时短,实验现象正确、明显,学生能够更清楚地观察到水沸腾前后温度、气泡、声音的变化,掌握水沸腾的条件.

The water boiling experiment was improved .A big test tube containing 80 ℃ water was used to carry out the boiling experiment .The number of bubbles was clearly increased ,and the rising distance of bubbles became longer .The experimental time was reduced ,and the experimental phenomena were right and obvious .Students could clearly observe the changes of temperature ,the bubbles and the voice ,and grasp the condition of boiling comprehensively .