论文部分内容阅读
取一平底烧瓶,注入适量稀盐酸,将内盛少量碳酸钠粉末的瘪气球套在瓶口,用胶条密封.烧瓶放在天平上,平衡时记下质量.把气球里的碳酸钠粉末抖落于瓶内稀盐酸中,迅速产生的二氧化碳会使瓶内压强增大将气球鼓起,到反应停止气球已被鼓圆.由于浮力的作用,天平已不能保持平衡.在天平有气球的一端加上砝码,移动游码,使天平恢复平衡,记下质量.前后质量之差即为气球排开空气的质量.
Take a flat-bottomed flask, inject a proper amount of dilute hydrochloric acid, and place a small amount of sodium carbonate powder in the bottle. Seal it with a plastic strip. Place the flask on the balance and record the mass when balancing. Dilute the sodium carbonate powder from the balloon. Fall in the bottle of dilute hydrochloric acid, the rapid production of carbon dioxide will increase the pressure inside the balloon to balloon up to the reaction to stop the balloon has been bulged. Due to the role of buoyancy, balance can not maintain balance. At the end of the balloon with the balance plus On the weight, move the code, balance the balance, record the quality. The difference between the quality before and after the balloon is to open the air quality.