เปรียบเทียบวิธี

	กฎของฟิค (Fick's Laws)	การประมาณแบบบูสเนสค์	การแพร่แบบสเตฟาน-แมกซ์เวลล์
สาขาวิชา	อุณหพลศาสตร์	อุณหพลศาสตร์	อุณหพลศาสตร์
ตระกูล	Process / pipeline	Process / pipeline	Process / pipeline
ปีกำเนิด	1855	1903	1871
ผู้ริเริ่ม	Adolf Fick	Joseph Boussinesq	Josef Stefan and James Clerk Maxwell
ประเภท	Diffusion law	Approximation technique	Diffusion equation
แหล่งต้นตำรับ	Fick, A. (1855). On liquid diffusion. Philosophical Magazine, 10(63), 30-39.	Boussinesq, J. (1903). Théorie Analytique de la Chaleur. Gauthier-Villars.	Reid, R. C., Prausnitz, J. M., & Poling, B. E. (1987). The Properties of Gases and Liquids (4th ed.). McGraw-Hill. ISBN: 978-0071247009
ชื่อเรียกอื่น	diffusion equation, Fickian diffusion	buoyancy approximation, Boussinesq model	Stefan-Maxwell equation, multicomponent diffusion
ที่เกี่ยวข้อง	3	3	3
สรุป	Fick's Laws describe how species diffuse through media due to concentration gradients. The First Law (steady-state) relates diffusion flux to concentration gradient, while the Second Law (transient) describes how concentration changes over time. These laws are fundamental to mass transfer analysis, applying to gases, liquids, and solids. Fick's Laws are analogous to Fourier's Law of heat conduction, replacing temperature with concentration.	The Boussinesq Approximation simplifies the governing equations for natural convection by treating density as constant except in the buoyancy term. This approximation is valid when temperature variations produce small density changes and allows researchers to solve coupled heat-fluid flow problems without solving the full, nonlinear compressibility equations. The Boussinesq Approximation is fundamental to analyzing buoyancy-driven flows in buildings, enclosures, and geophysical applications.	The Stefan-Maxwell diffusion equation describes how multiple chemical species diffuse through each other in a mixture, accounting for interactions between all species pairs. Unlike Fick's law, which assumes species diffuse independently, Stefan-Maxwell theory captures the coupling that occurs when species with different diffusivities move at different rates. This is essential for analyzing gas separation, combustion, catalytic processes, and reactive distillation.