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【教学目标】1.能从实验结果中分析出液态水经蒸发变成气态的水蒸气,并带走一定的热量。2.能通过实验探究常温下水蒸发快慢与哪些因素有关。【教学重难点】1.能从实验结果中分析出液态水经蒸发变成气态的水蒸气,并带走一定的热量。2.能通过实验探究常温下水蒸发快慢与哪些因素有关。【教学准备】清水,温水,玻璃黑板,湿布,温度计,棉纱,玻璃片,酒精灯,广口瓶,扇子,棉签。【教学过程】一、导入新课
【Teaching Objectives】 1. From the experimental results, it can be analyzed that the liquid water is vaporized into a gaseous water vapor and take away some heat. 2. Through experiments to explore the speed of water evaporation at room temperature and what factors. Difficult teaching】 【1 can be analyzed from the experimental results of liquid water vaporized into a vapor, and take away some heat. 2. Through experiments to explore the speed of water evaporation at room temperature and what factors. 【Teaching Preparation】 water, warm water, glass blackboard, wet cloth, thermometer, cotton yarn, glass, alcohol lamp, jar, fan, cotton swab. Teaching process First, import a new lesson