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 Slideshow Play

A tokamak Student activity Play

A tokamak Whiteboard exercise 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

Additional information contained in chemical equations Student activity Play

Adiabatic transitions in heat engines Student activity Play

Air pollution Student activity Play

Air pollution Student activity Play

Air pressure Class activity Play

Air pressure Whiteboard presentation Play

Allotropy of oxygen Illustration Play

Ammonia and nitric acid Class activity Play