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1.演示液体的热胀冷缩性质向日光灯管中加满温水,用中间插有细玻璃管的橡皮泥塞紧管口,用酒精灯对管内液体加热片刻,可见细管中液面上升;停止加热,将日光灯管浸入冷水中,可见液面下降,说明液体受热膨胀,受冷收缩。2.演示水沸腾实验向日光灯管中加热水近满,用酒精灯对水加热,观察水沸腾前后产生的气泡在上升过程中的体积变化,现象非常明
1. Demonstrate the thermal expansion and contraction of the liquid. Fill up the fluorescent tube with warm water, insert the tube with a thin glass tube in the middle of the tube, and use the alcohol lamp to heat the tube for a while. The liquid level in the tube rises. When heating is stopped, the fluorescent tube is immersed in cold water, and it can be seen that the liquid surface drops, indicating that the liquid expands by heat and shrinks by cold. 2. Demonstrate the water boiling experiment. Heat the water in the fluorescent tube near the full. Use an alcohol lamp to heat the water. Observe the volume change during the rise of bubbles before and after the water boiling. The phenomenon is very clear.