ChemistryScalar QuantityNCTB রসায়ন অধ্যায় ২ (পদার্থের অবস্থা)
Diffusion & Graham's Law
Bengali: ব্যাপন ও গ্রাহামের সূত্র•Pronunciation: ডিফিউশন অ্যান্ড গ্রাহামস ল•Symbol: r
Standard Definition:
The spontaneous net movement of particles from an area of higher concentration to an area of lower concentration.
📐 Mathematical Equation, Units & Dimensions
Defining Mathematical Equation
Standard SI Unit
Diffusion rate: mL/s or mol/s(ব্যাপন হার: $mL/s$ বা $mol/s$)
Dimensional Analysis
CGS Unit
cm^3/s
📖 Physical Concept & Comprehensive Explanation
Graham's law dictates that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molar mass. Lighter gases travel significantly faster than heavier molecules at equal thermal kinetic temperatures.
🎯 High-Yield Revision Points
- ✓Diffusion is spontaneous; effusion occurs through a pinhole under pressure.
- ✓Graham's law: Rate is inversely proportional to the square root of molar mass.
- ✓Lighter molecules diffuse faster than heavier molecules.
Use Online Solver for Diffusion & Graham's Law
Compute step-by-step solutions, verify formulas, and plot interactive diagrams on biggan.me.
❓ Frequently Asked Exam Questions (FAQ)
Common questions in board and competitive entrance examinations
Q1: What is the difference between diffusion and effusion?
Diffusion is spontaneous dispersal through concentration gradients; effusion is forced escape through microscopic apertures under pressure.