一、测定方法要正确测定挥发性液体样品的燃烧热,关键的问题是要正确称取样品和使样品完全燃烧。挥发性液体样品的称取方法是,取一只预先称好重量的玻璃小球(直径约6mm),用注射器将样品装进小球,再在煤气灯上把小球的玻璃管口封死。玻璃小球在装样前后重量之差就是液体样品的重量。再取一片预先压好的带有点火丝的标准样品(如苯甲酸),称重后系 First, the determination method To correctly determine the combustion heat of volatile liquid samples, the key problem is to properly weigh the sample and make the sample completely burned. The volatile liquid sample was weighed by taking a pre-weighed glass pellet (about 6 mm in diameter), placing the sample in a small syringe with a syringe, and sealing the glass bulb of the pellet on a gas light. The difference in weight between the glass pellets before and after loading is the weight of the liquid sample. Then take a standard sample (such as benzoic acid) pre-compressed with ignition wire and weigh it.