大凡新思想、新学说都萌芽于一个“疑”字。意大利诗人但丁指出:“我喜欢怀疑并不下于知识。”从人类认识发展规律看,任何科学发明与创造往往都是从质疑开始,从释疑入手,从无疑到有疑,再从解释到创新。化学史每一个阶段的进展也都是从质疑开始的。如,英国物理学家瑞礼在研究氮气时,发现从空气中制得氮气在标准状况下的密度大于由含氮化合物制得的氮气密度,二者 Generally new ideas, new theories are all sprouting in a “suspect” word. Dante, the Italian poet, pointed out: “I like to doubt that there is no less than knowledge.” From the perspective of human understanding and development, any scientific invention and creation often starts with questioning, starts with disillusionment, from doubt to suspicion, To innovation. The progress of each stage of chemical history is also from the beginning of the question. For example, the British physicist Rui Li in the study of nitrogen, found in the nitrogen from the air in the standard conditions of density greater than the density of nitrogen made from nitrogen compounds, both