A chain of fission reactions Student activity Play

A chain of fission reactions Animation Play

A chain of fission reactions Whiteboard exercise Play

A change in the state of matter Animation Play

A diagram of the operation of a gas turbine engine Animation Play

A laser Student activity Play

A mercury barometer Animation Play

A microscopic view Animation Play

A mixture of nitrogen dioxide and dinitrogen tetroxide gases Whiteboard exercise Play

A pump Animation Play

A tokamak Whiteboard exercise Play

A tokamak Student activity Play

A tokamak Slideshow Play

Ability to react with carbonates Animation Play

Ability to react with metals Animation Play

Absolute values of entropy Student activity Play

Absolute zero Animation Play

Absorption and emission of gases Student activity Play

Absorption spectrum of gases Student activity Play

Acids (2) Student activity Play

Adding natural numbers using the written method Student activity Play

Additional information contained in chemical equations Student activity Play

Adiabatic transitions in heat engines Student activity Play

Advantages and disadvantages of using renewable energy sources Animation Play

Adverse effects of natural substances in food Slideshow Play