Surface Area
| Also Known As | SA, exposed area, available surface, reactive surface area |
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What is Surface Area?
The total area of the surface of a solid or liquid. Increasing surface area increases reaction rate by exposing more reactant molecules to collision. This is why powdered solids react faster than chunks, and why catalysts are often used in finely divided or porous forms.
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The total area of the surface of a solid or liquid. Increasing surface area increases reaction rate by exposing more reactant molecules to collision. This is why powdered solids react faster than chunks, and why catalysts are often used in finely divided or porous forms.
Industrial catalysts are prepared with high surface areas (e.g., porous supports) to maximise reaction rates. Activated charcoal has a high surface area used for adsorption of toxins and gases. Lung alveoli maximise gas exchange surface area in biological systems.
High surface area materials (fine powders, nanoparticles) can form explosive or toxic dust clouds. Nanoparticles may penetrate biological barriers and their safety profiles are actively researched. Dust control measures are important when handling fine solid materials.