Note that compound units are formed by using *, / and ^. For example, an acceleration might be in terms of "m/s^2" or meters per second squared. This could also be expressed as"m/s/s". Units of Newton-meters (for torque) would be entered as "N*m". Parentheses may be used to guarantee the correct sense of the unit. Kilometers per Ampere-hour could be written as "km/(A*hr)" or "km/A/hr" but not "km/A*hr". The last option would be interpreted as kilometer times hours per Ampere.

LON-CAPA will automatically perform some conversions between units of the same dimension when units are provided for a problem. You can provide an answer of "1.45 km" for a distance. If the computer expects the answer in cm, it will convert your answer before comparing against the numerical solution.

Please note that if your units are inappropriate, the computer has no way of checking the appropriateness of your answer. If units are required, only once appropriate units are provided will the system check your numerical answer.

# name symbol comment meter m # length kilogram kg # mass second s # time ampere A # electric current kelvin K # thermodynamic temperature mole mol # amount of substance candela cd # luminous intensity decibel dB # log of pressure amplitude

# Prefix symbol factor yotta Y 10^{24} zetta Z 10^{21} exa E 10^{18} peta P 10^{15} tera T 10^{12} giga G 10^9 mega M 10^6 kilo k 10^3 hecto h 10^2 deca D 10^1 deci d 10^-1 centi c 10^-2 milli m 10^-3 micro u 10^-6 nano n 10^-9 pico p 10^{-12} femto f 10^{-15} atto a 10^{-18} zepto z 10^{-21} yocto y 10^{-24}

# Derived Unit # name symbol comment gram g # mass minute min # time hour hr # time hour h # time day day # time day days # time year yr # time pound lb # mass ounce oz # mass inch in # length foot ft # length mile mi # length yard yd # length nautical_mile n_mi # length, nautical mile (UK) rood rood # area, rood acre acre # area, acre hertz Hz # frequency litre L # volume newton N # force pound_force lbf # force dyne dyn # force pascal Pa # pressure, stress bar bar # pressure mmHg mmHg # pressure, millimeter of mercury torr torr # pressure atm atm # standard atmosphere joule J # energy, work, heat electronvolt eV # energy calorie cal # energy Btu Btu # energy watt W # power, radiant flux coulomb C # electric charge volt V # electric potential, electromotive force ohm ohm # electric resistance, use this in /ANS ohm ohms # electric resistance ohm Ohm # electric resistance ohm Ohms # electric resistance mho mho # electric conductance mho mhos # electric conductance mho Mho # electric conductance mho Mhos # electric conductance siemens S # electric conductance farad F # electric capacitance tesla T # magnetic flux density weber Wb # magnetic flux henry H # inductance radian rad # plane angle degree deg # plane angle (Pi rad=180 deg) steradian sr # solid angle lumen lm # luminous flux lux lx # illuminance becquerel Bq # activity (radioactive) curie Ci # activity (radioactive) gray Gy # absorbed dose (of radiation) sievert Sv # dose equivalent (dose equivalent index) astroUnit AU # mean distance earth to sun celcius degC # multiplicatively OK fahrenheit degF # multiplicatively OK molarity M # chemisty amu amu # atomic mass unit amu u # atomic mass unit lightspeed c # speed of light cubiccentimeter cc # cubic centimeter electroncharge e # elementary charge hbar hbar # Planck constant milesperhour mph # miles per hour rpm rpm # rounds per minute rpm rpms # rounds per minute parsec pc # parsec