For an organism to function, substances must move into and out of cells. Three processes contribute to this movement - diffusion, osmosis and active transport. Diffusion is the process by which useful materials and waste products move in...

A series of incident rays and their corresponding reflected rays are depicted in the diagrams in this tutorial. Each ray strikes a surface with a different orientation; yet each ray reflects in accordance with the law of reflection.

Explore the passive transport process of diffusion.

The General Chemistry Virtual Textbook, or Chem 1, is broken into several sections covering various aspects of topics related to chemistry. This section deals with diffusion along with topics such as concentration gradient and random...

Students are asked to explain the process shown as the red material is placed in the colorless liquid.

Observe the movement of neon atoms in a quadruple nanotube joint.

An in-depth discussion on reflection of light can be found here. Among the topics discussed include are the difference between specular and diffuse reflection, concave and convex mirrors, facets, total internal reflection, and much more....

[Free Registration/Login may be required to access all resource tools.] This tutorial serves as an introduction to active transport and explains how to distinguish active transport from facilitated diffusion.

Lists specific transport mechanisms occurring in different parts of the nephron, including active transport, osmosis, facilitated diffusion, and passive electrochemical gradients.

An interactive Java applet which depicts gas diffusion and emphasizes the importance of thermal equilibrium. Directions and challenges available.

An activity where students observe water moving by the process of diffusion.

[Free Registration/Login may be required to access all resource tools.] Tutorial defines osmosis and the difference between osmosis and diffusion. Students will learn how to distinguish solute from solvent and solution and the hypotonic,...

AP Human Geography course learning module on cultural patterns explores characteristics and diffusion of culture, including folk, pop and art.

Students learn about the different structures that comprise cell membranes, fulfilling part of the Research and Revise stages of the legacy cycle. Students view online animations of cell membrane dynamics (links provided). Then they...

This site from Architectural Acoustics and Lighting provides a discussion of various factors affecting the acoustics of a given room. Room dimensions, the wavelength of the sound wave, the physical characteristics of the walls, the...

This seven-page Biology course handout gives a detailed explanation, accompanied by many illustrations, of the various processes by which substances travel across the membranes of cells.

This definition and explanation osmosis shows how water diffuses from regions where it is in high concentration to regions where it is in low concentration.

Based off of the hit television show NUMB3RS, this lesson shows students a real-world application to matrices and matrix operations. Framed in the context of a stolen painting which the thief may hide at different warehouses, students...

Based off of the hit television show NUMB3RS, this lesson shows students a real-world application to matrices and matrix operations. Framed in the context of a stolen painting which the thief may hide at different warehouses, students...

Learn all about cell membranes in this game. Build a plasma membrane and learn about the membrane's functions. Identify the parts of a membrane, and learn how diffusion, transport, and osmosis work in cells. Includes a worksheet that can...

Graphic from a slide show shows the concept of effusion nicely. Definitions included.

Click on "Asante," for a description of African states during this political transition. Links to related information.

In this inquiry-based lab, students investigate the phenomenon of molecular motion. They will understand the relationship between temperature and molecular speed, the relationship between concentration and diffusion rate, and what...

The General Chemistry Virtual Textbook, or Chem 1, is broken into several sections covering various aspects of topics related to chemistry. This section deals with random molecular motion and topics such as diffusion and effusion.