物理与工程2025，Vol.35Issue(5)：55-60,6.
气体输运过程微观机制的"2λ问题":一个教学方案
THE"2λ PROBLEM"IN THE MICROSCOPIC MECHANISM OF GAS TRANSPORT:A TEACHING SCHEME
摘要
Abstract
The"2λ problem"(the mean free path of a molecule crossing a boundary is twice the mean free path in the gas molecules)in deriving the microscopic mechanism of transport coefficients for gases is a common point of confusion in thermal physics teaching.This paper first systematically reviews the treatment of this problem in domestic and foreign textbooks and domestic teaching papers,including solid angle integration and one-dimensional motion simplified models.Then,a classroom teaching scheme using line segments to represent mo-lecular free paths is proposed,and some key issues related to it are discussed.This scheme al-lows students to qualitatively understand and accept the conclusions related to"2λ"in a short class time without the need for integral calculations.关键词
气体输运过程/分子动理论/平均自由程/教学方案Key words
gas transport properties/kinetic theory of gases/mean free path/teaching scheme引用本文复制引用
赵可..气体输运过程微观机制的"2λ问题":一个教学方案[J].物理与工程,2025,35(5):55-60,6.基金项目
2022年西南交通大学高水平育人课程教学改革项目一流本科课程建设专项-普通物理-热学 （）
教育部高等学校物理学类专业教学指导委员会2025年度高等学校热学课程教学研究项目(编号:JZW-25-RX-08). （编号:JZW-25-RX-08）
