Learn how compressed formats such as zip, gzip, or gif images are all based on a method called Ziv-Lempel coding, which turns out to be an interesting exercise in finding patterns in text.

Students learn about nanocomposites, compression and strain as they design and program robots that compress materials. Student groups conduct experiments to determine how many LEGO MINDSTORMS NXT motor rotations it takes to compress soft...

Practice using lossless text and image compression algorithms and considering what data can be compressed most easily.

Check your understanding of lossy and lossless compression techniques, in this set of free practice questions designed for AP Computer Science Principles students.

Computers represent all data in binary, so all types of files, from text to images to videos, are ultimately sequences of bits. Regardless of whether the bits represent a document or a GIF, computers can use a bit compression technique...

Lossless text compression is discussed.

Lossless single image compression by using the algorithm run-length encoding (RLE).

Using Lossy Compression to reduce a file size.

A very informative article about the process of video compression for the web.

Determine the internal energy in a sample of gas that goes through an isothermal compression.

Through inquiry, learners will use various objects/materials attached to strings to investigate how vibration causes sounds waves.

Explore the particle model of matter. Run the simulations and see if you can predict the results.

[Free Registration/Login Required] Observe what happens to volume as pressure is changed, and then answer a challenge question after the activity.

Determine the work that was done when no heat enters or leaves the system. A video describing the problem can be found here: https://www.youtube.com/watch?v=vt0u94PtbJ8&feature=youtu.be

Students use a tension-compression machine or an alternative bone-breaking setup to see how different bones fracture differently and with different amounts of force, depending on their body locations. Teams determine bone mass and...

Students work within constraints to construct model trusses and then test them to failure as a way to evaluate the relative strength of different truss configurations and construction styles. Each student group uses Popsicle sticks and...

Students identify different bridge designs and construction materials used in modern day engineering. They work in construction teams to create paper bridges and spaghetti bridges based on existing bridge designs. Students progressively...

Working individually or in groups, students explore the concept of stress (compression) through physical experience and math. They discover why it hurts more to poke themselves with mechanical pencil lead than with an eraser. Then they...

In this activity, students will learn that compressed air creates pressure to propel an air balloon. Students will create a graph in their science journals based on the relationship between the number of air pumps and the distance the...

This activity explores how images are displayed, based on the pixel as a building block using data compression. The compression method used in this activity is based on the one used in fax machines, for black and white images.

A collection of video lectures from a course introducing students to the theory and practices in digital communications. Webpage includes twenty-four lectures from a professor at the Massachusetts Institute of Technology. Lectures vary...

Find detailed notes on CPR. Includes information on the function of rescue breathing and chest compressions and steps for performing CPR on adults and on infants.

[Free Registration/Login Required] An animation to illustrate the effects that different tectonic stresses have on rocks. Also included on the site is a short quiz over tension and compression.

A collection of free learning activities that teach computer science through games and puzzles that use cards, string, crayons and lots of running around. The activities introduce students to computational thinking through concepts such...