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Chemistry is the study of the constitution of matter and its interactions; it has numerous applications, including biochemistry, electrochemistry and nuclear chemistry.

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physics: mechanics
Mechanics is the study of force and motion. A mechanism is defined by two forces: the driving force (effort) and the resistant force (load).

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physics: electricity and magnetism
Electromagnetism is the study of the relationship between electricity and magnetism. Its many applications include motors, loudspeakers, measurement instruments and computers.

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physics: optics
Optics: the scientific study of light and vision; its various applications include lenses, microscopes, lasers and fiber optics.

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measuring devices
Instruments for determining various quantities such as temperature, mass, height, length, voltage and mechanical force.

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scientific symbols
Standardized signs that have been adopted by convention to simplify the writing of numbers, formulas and equations used in science and technology.