Definition
Diffusion is the passive movement of molecules or ions from an area of higher concentration to an area of lower concentration, resulting in the equal distribution of substances within a given space. This process occurs until dynamic equilibrium is reached, where the concentration of the substance is uniform throughout.
Summary
Diffusion is a vital process that allows substances to move from areas of high concentration to low concentration, achieving balance within systems. It plays a crucial role in biological functions, such as gas exchange in lungs and nutrient absorption in cells. Understanding diffusion helps explain how materials interact in various environments, from cellular processes to everyday occurrences like the spreading of scents. The rate of diffusion is influenced by several factors, including temperature, concentration gradient, and the size of molecules. By grasping these concepts, students can appreciate the significance of diffusion in both natural and industrial contexts, paving the way for further exploration into related topics like osmosis and active transport.
Key Takeaways
Diffusion is Essential
Diffusion is a fundamental process that occurs in many biological and physical systems, allowing for the movement of substances.
highConcentration Gradient Drives Diffusion
The difference in concentration between two areas is what drives the diffusion process.
mediumTemperature Affects Rate
Higher temperatures increase molecular movement, thus speeding up diffusion.
mediumEquilibrium is Key
Diffusion continues until equilibrium is reached, where concentrations are equal.
low