A weight on a spring Animation Play

A wheel and a rotating chair Animation Play

A wheelbarrow Animation Play

A yo-yo Animation Play

A zero within a given interval Animation Play

AA property of similar triangles Animation Play

Aberration Animation Play

Ability to colour litmus blue Animation Play

Ability to colour litmus red Animation Play

Ability to conduct electricity Animation Play

Ability to react with carbonates Animation Play

Ability to react with metal salts Animation Play

Ability to react with metals Animation Play

About altering the x-scale Animation Play

Absolute pitch Animation Play

Absolute value of the argument of a function Animation Play

Absolute zero Animation Play

Absorption Animation Play

Absorption and emission of energy Animation Play

Absorption and utilization of glucose Animation Play

Absorption and utilization of proteins Animation Play

Absorption of light by transition metal ions Animation Play

Absorption of lipids through the intestinal wall Animation Play

Absorption of the photon energy Animation Play

Absorption of the products of carbohydrate digestion Animation Play

Absorption of the products of lipid digestion Animation Play

Absorption of the products of protein digestion Animation Play

Absorption of visible light Animation Play

Absorption spectrum of gases Animation Play

Abundance of the elements in the crust and in the whole Earth Animation Play