Skip to Main Content

Principal Sponsors

The William and Flora Hewlett Foundation
The Hewlett Logo

Makes grants to address the most serious social and environmental problems facing society, where risk capital, responsibly invested, may make a difference over time.
The NSF LogoNational Science Foundation

An independent federal agency created by Congress in 1950 to promote the progress of science.

Other Sponsors Logo

Legend

Symbol Meaning
Not standalone Guidance Recommended: This simulation is very effective when used in conjunction with a lecture, homework or other teacher designed activity.
Alpha Rating Image Under Construction: This simulation is a preview version, and may have functional or usability bugs.
Checkmark Rating Image Classroom Tested: This simulation has been used and tested in the classroom, and on multiple computer platforms. The simulation has been refined based on that experience and on student interviews.
Image of Gold Star Gold Star Contribution: This contribution has received a Gold Star because it is a high quality inquiry-based activity that follows the PhET design guidelines (PDF) and teachers have found it useful.
Designed by PhET Icon PhET Designed: This contribution was designed by PhET.
Login / Register