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酒精灯是化学和其他各类实验中常用的加热仪器。正确使用酒精灯灯焰给物质加热,既是实验成功的保证,又是培养学生节约资源的好素材。在此介绍一种比较酒精灯灯焰各部分温度的新方法。点燃酒精灯,用一张纸(最好是滤纸)沿水平方向穿过焰芯横截灯焰,约2s 后取出,纸上留下一个黑色的圆环(如图1);换一张纸,沿与水平面成45°夹角的方向穿过焰芯斜截灯焰,约2s 后取出,纸上留下一个黑色的椭圆环(如图2)。纸上
Alcohol lamps are commonly used heating devices in chemistry and other types of experiments. The correct use of the alcohol lamp flame to heat the material is both a guarantee of successful experimentation and a good source of resources for students to conserve resources. A new method for comparing the temperature of the various parts of an alcohol lamp is described here. Ignite the lamp, use a sheet of paper (preferably filter paper) to cross the flame in the horizontal direction across the flame, take it out after about 2 seconds, leave a black ring on the paper (Figure 1); change paper , Traverse the flame core flame in the direction of an angle of 45° with the horizontal plane, remove it after about 2 seconds, and leave a black oval ring on the paper (see Figure 2). On paper