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"R" Measurements Recognized by the Measurement Conversion Calculator |

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 = rad (plane angle)
- R = roentgen (radiation exposure)
- rad (radian) = rad (plane angle; base unit)
- Rad = 0.01 Gy (absorbed dose)
- radian = rad (plane angle)
**Radiance**- radiance = W/m^2*sr (radiance; category unit)
- radiant energy = energy (energy)
- radiant energy density = pressure (pressure)
- radiant exitance = heat flux density (heat flux density)
- radiant flux = power (power)
- radiant flux received = heat flux density (heat flux density)
**Radiant Intensity**- radiant intensity = W/sr (category unit)

- radiant intensity = W/sr (radiant intensity; category unit)
- radiant power = power (power)
**Radiation Exposure**- radiation exposure = specific charge (specific charge)
- radioactivity = frequency (frequency)
- rankine = dR (thermodynamic temperature)
- rd = rod (length)
- reactance = electric resistance (electric resistance)
- reaction rate = concentration rate (concentration rate)
- ream (of paper) = 20 quire
- reaumur = dRe (thermodynamic temperature)
- refrigeration = 12000 BTU/ton*hour (unknown units)
- register ton = 100 ft^3 (volume)
- rehoboam = 3 magnum (volume)
**Reluctance**- reluctance = 1/H (category unit)

- reluctance = 1/H (reluctance; category unit)
**Reluctivity**- reluctivity = 1/H*m (category unit)

- reluctivity = 1/H*m (reluctivity; category unit)
- rem = 0.01 Sv (dose equiv)
**Replaced Values**- / = replacement for " per "
- ^2 = replacement for "squared"
- ^3 = replacement for "cubed"
- ap = replacement for "apoth"
- ap = replacement for "apothecary"
- equiv = replacement for "equivalent"
- fl = replacement for "liq"
- fl = replacement for "liquid"
- foot (" foot ") = replacement for "'"
- foot = replacement for "feet"
- inch (" inch ") = replacement for """
- inch = replacement for "inches"
- intl = replacement for "international"
- oz = replacement for "ounce"
- UK ("UK ") = replacement for "imp "
- UK = replacement for "British"
- UK = replacement for "imperial"
- y ("y ") = replacement for "ies "
- yr = replacement for "year"

**Replacements**- ' = " foot "
- " = " inch "
- *approx = ""
- *avg = ""
- *exact = ""
- apoth = "ap"
- apothecary = "ap"
- approx = ""
- avdp = ""
- avg = ""
- avoirdupois = ""
- British = "UK"
- cubed = "^3"
- equivalent = "equiv"
- exact = ""
- feet = "foot"
- ies ("ies ") = "y "
- imp ("imp ") = "UK "
- imperial = "UK"
- inches = "inch"
- international = "intl"
- liq = "fl"
- liquid = "fl"
- ounce = "oz"
- per (" per ") = "/"
- squared = "^2"
- year = "yr"

- resistance = electric resistance (electric resistance)
**Resistivity**- resistivity = ohm*m (category unit)
- volume resistivity = resistivity

- resistivity = ohm*m (resistivity; category unit)
- rev = revolution (plane angle)
- revolution = 2 pi*rad (plane angle)
- reyn = lbf*s/in^2 (dynamic viscosity; derived unit)
- rhe = 10 m^2/N*s (fluidity)
- ri (Japanese ri) = 2.44 mile (length)
- rod (surveyors rod) = 25 link (length)
- roentgen = 0.000258 A*s/kg (radiation exposure)
- Roman amphora = 6.84 gallon (volume)
- Roman cubit = 17.5 in (length)
- Roman foot = 0.971 foot (length)
- Roman mile = 5000 Roman foot (length)
- Roman obolus = 8.77 grain (mass)
- Roman talent = 125 libra (mass)
- rood = 40 rod^2 (area)
- rope = 20 ft (length)
- rotational acceleration = angular acceleration (angular acceleration)
- rotational frequency = angular velocity (angular velocity)
- rpm (revolutions per minute) = revolution/minute (angular velocity; derived unit)
- rutherford = 1000000 Bq (activity)
- rydberg = 1.36054 electron volt (energy)

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