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Parts-per notation
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In science and engineering, parts-per notation is a set of pseudo-units to describe the small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction.
Fluorescein aqueous solutions, diluted from 10000 to 1 part per million in intervals of ten-fold dilution. At 10000 ppm the solution is a deep red colour. As the concentration decreases, the colour becomes greenish-orange, then a vibrant yellowish-green, with the final 1 ppm sample a very pale yellowish-green.
Fluorescein aqueous solutions, diluted from 10000 to 1 part per million in intervals of ten-fold dilution. At 10000 ppm the solution is a deep red col
Engineering
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Engineering is the practice of systematically applying natural science and mathematics to design and improve systems, devices, or processes that solve problems under constraints. It is typically motiv
Parts-per notation
…In science and engineering, parts-per notation is a set of pseudo-units to describe the small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction…
The steam engine, the major driver in the Industrial Revolution, underscores the importance of engineering in modern history. This beam engine is on d
The steam engine, the major driver in the Industrial Revolution, underscores the importance of engineering in modern history. This beam engine is on display in the Technical University of Madrid.
The Ancient Romans built aqueducts to bring a steady supply of clean and fresh water to cities and towns in the empire.
The Ancient Romans built aqueducts to bring a steady supply of clean and fresh water to cities and towns in the empire.
A water-powered mine hoist used for raising ore, Germany, c. 1556
A water-powered mine hoist used for raising ore, Germany, c. 1556
The application of the steam engine allowed coke to be substituted for charcoal in iron making, lowering the cost of iron, which provided engineers wi
The application of the steam engine allowed coke to be substituted for charcoal in iron making, lowering the cost of iron, which provided engineers with a new material for building bridges. This bridge was made of cast iron, which was soon displaced by less brittle wrought iron as a structural material.