Arithmetic mean – the 'true' value of the data Student activity Play

Arithmetic mean – the 'true' value of the data Whiteboard exercise Play

Astronomical numbers Animation Play

Atomic and molecular mass Class activity Play

Atomic and molecular mass Whiteboard presentation Play

Atomic bomb Student activity Play

Atomic bomb Animation Play

Atomic bomb Whiteboard exercise Play

Atomic mass and atomic radii Illustration Play

Atomic mass of an element Animation Play

Atomic mass of an element Whiteboard exercise Play

Atomic mass of an element Student activity Play

Atomic masses in the periodic table Student activity Play

Atomic number and mass number Student activity Play

Atomic numbers and mass numbers of the elements Animation Play

Attraction between point masses and homogeneous balls Student activity Play

Avalanche of fission reactions Student activity Play

Avalanche of fission reactions Animation Play

Average Animation Play

Average and instantaneous speed Whiteboard exercise Play

Average and instantaneous speed Student activity Play

Average concentration of CO in the atmosphere Slideshow Play

Average monthly temperatures Whiteboard exercise Play

Average of the Earth's density Animation Play

Average price Whiteboard exercise Play