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Measures and Units


This resource provides clear definitions of all the units, prefixes and styles of the Système International (SI), as well as traditional and industry-specific units. The terms are taken from a broad range of subjects including astronomy, electromagnetics, geology, photography, mathematics, meteorology, physics, and temperature.
On this page: R to Rydberg constant.

Title Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
R:  A

R (physics, electromagnetics, engineering)
R unit (radiation physics)
R value (engineering)
radiation constant (fundamental constant)
rank (energy, temperature)
rayl (acoustics)
rayleigh (optics)
Rayleigh number (rheology)
Réaumur (being)
Reech number (rheology)
relative atomic mass (in chemistry)
relative molecular mass (physical chemistry)
revolution (in politics)
reyn (fluid mechanics)
Reynolds number (in chemistry, aerodynamics)
rhe (fluid mechanics)
rhm (nucleonics)
Richter scale (measure, system)
right ascension (in astronomy)
ringing equivalent number (telecommunications)
RMS (electromagnetics)
Roemer (temperature)
rom (Memory hardware)
Roman numerals (numerical symbols)
rood (in art, architecture)
rowland (spectroscopy)
RPM (investment)
RSI (condition)
Rydberg constant (in physics)