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PheT Interactives

Free science and math simulations for teaching STEM topics, including physics, chemistry, biology, and math, from University of Colorado Boulder.

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Blackbody Spectrum
Unrestricted Use
CC BY
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How does the blackbody spectrum of the sun compare to visible light? Learn about the blackbody spectrum of the sun, a light bulb, an oven, and the earth. Adjust the temperature to see the wavelength and intensity of the spectrum change. View the color of the peak of the spectral curve.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Kathy Perkins
Michael Dubson
Wendy Adams
Date Added:
11/15/2007
Build a Molecule
Unrestricted Use
CC BY
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Starting from atoms, see how many molecules you can build. Collect your molecules and see them in 3D!

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Christine Denison
Emily Moore
John Blanco
Jonathan Olson
Kathy Perkins
Kelly Lancaster
Sam Reid
Date Added:
06/27/2011
Build-a-fraction
Unrestricted Use
CC BY
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Build fractions from shapes and numbers to earn stars in this fractions game or explore in the Fractions Lab. Challenge yourself on any level you like. Try to collect lots of stars!

Subject:
Mathematics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Ariel Paul
Karina Hensberry
Kathy Perkins
Mike Dubson
Sam Reid
Trish Loeblein
Date Added:
10/17/2012
Build an Atom
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CC BY
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Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!

Subject:
Chemistry
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Jack Barbera
John Blanco
Kathy Perkins
Kelly Lancaster
Patricia Loeblein
Robert Parson
Sam Reid
Suzanne Brahmia
Date Added:
07/13/2011
Buoyancy (AR)
Unrestricted Use
CC BY
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When will objects float and when will they sink? Learn how buoyancy works with blocks. Arrows show the applied forces, and you can modify the properties of the blocks and the fluid.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Archie Paulson
Carl Wieman
Chris Malley
Jonathan Olson
Kathy Perkins
Kelly Lancaster
Noah Podolefsky
Patricia Loblein
Sam Reid
Wendy Adams
Date Added:
10/01/2010
Collision Lab
Unrestricted Use
CC BY
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Investigate collisions on an air hockey table. Set up your own experiments: vary the number of discs, masses and initial conditions. Is momentum conserved? Is kinetic energy conserved? Vary the elasticity and see what happens.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Ariel Paul
Jon Olson
Kathy Perkins
Mike Dubson
Mindy Gratny
Sam Reid
Trish Loeblein
Date Added:
10/01/2010
Color Vision
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CC BY
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Make a whole rainbow by mixing red, green, and blue light. Change the wavelength of a monochromatic beam or filter white light. View the light as a solid beam, or see the individual photons.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Chris Malley
Danielle Harlow
Kathy Perkins
Ron LeMaster
Wendy Adams
Date Added:
10/30/2006
Concentration
Unrestricted Use
CC BY
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Watch your solution change color as you mix chemicals with water. Then check molarity with the concentration meter. What are all the ways you can change the concentration of your solution? Switch solutes to compare different chemicals and find out how concentrated you can go before you hit saturation!

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Chris Malley
Emily B. Moore
Julia Chamberlain
Kathy Perkins
Kelly Lancaster
Date Added:
03/09/2012
Conductivity
Unrestricted Use
CC BY
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Experiment with conductivity in metals, plastics and photoconductors. See why metals conduct and plastics don't, and why some materials conduct only when you shine a flashlight on them.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Kathy Perkins
Sam McKagan
Sam Reid
Wendy Adams
Date Added:
07/01/2004
Conductivity (AR)
Unrestricted Use
CC BY
Rating
0.0 stars

Experiment with conductivity in metals, plastics and photoconductors. See why metals conduct and plastics don't, and why some materials conduct only when you shine a flashlight on them.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Kathy Perkins
Sam McKagan
Sam Reid
Wendy Adams
Date Added:
07/01/2004
Coulomb's Law
Unrestricted Use
CC BY
Rating
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Visualize the electrostatic force that two charges exert on each other. Observe how changing the sign and magnitude of the charges and the distance between them affects the electrostatic force.

Subject:
Career and Technical Education
Electronic Technology
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Roland Van Kerschaver
Date Added:
03/06/2019
Curve Fitting
Unrestricted Use
CC BY
Rating
0.0 stars

With your mouse, drag data points and their error bars, and watch the best-fit polynomial curve update instantly. You choose the type of fit: linear, quadratic, cubic, or quartic. The reduced chi-square statistic shows you when the fit is good. Or you can try to find the best fit by manually adjusting fit parameters.

Subject:
Mathematics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Michael Dubson
Trish Loeblein
Date Added:
08/01/2008
Curve Fitting (AR)
Unrestricted Use
CC BY
Rating
0.0 stars

With your mouse, drag data points and their error bars, and watch the best-fit polynomial curve update instantly. You choose the type of fit: linear, quadratic, cubic, or quartic. The reduced chi-square statistic shows you when the fit is good. Or you can try to find the best fit by manually adjusting fit parameters.

Subject:
Mathematics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Michael Dubson
Patricia Loblein
Date Added:
08/02/2012
Davisson-Germer: Electron Diffraction
Unrestricted Use
CC BY
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Simulate the original experiment that proved that electrons can behave as waves. Watch electrons diffract off a crystal of atoms, interfering with themselves to create peaks and troughs of probability.

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Kathy Perkins
Sam McKagan
Sam Reid
Date Added:
10/02/2006
Density
Unrestricted Use
CC BY
Rating
0.0 stars

Why do objects like wood float in water? Does it depend on size? Create a custom object to explore the effects of mass and volume on density. Can you discover the relationship? Use the scale to measure the mass of an object, then hold the object under water to measure its volume. Can you identify all the mystery objects?

Subject:
Physical Science
Physics
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Archie Paulson
Carl Wieman
Chris Malley
Jonathan Olson
Kathy Perkins
Kelly Lancaster
Noah Podolefsky
Sam Reid
Trish Loeblein
Wendy Adams
Date Added:
02/16/2011