# Sources

This is a collection of places where I've gone to find constants, units, and other information. Not all sources agree on the same information, so what you find being used in the app may differ from what you come across here.

## Constants

- Constants of Physics and Mathematics (www.ebyte.it)
- What is the difference between Avogadro's number and Avogadro's constant (www.quora.com)
- The Mole and Avogadro's Constant (chem.libretexts.org)

### Physics

- Physical Constant (wikiwand.com)
- Fundamental Physical Constants (physics.nist.gov)
- Fundamental Physical Constants --- Complete Listing (physics.nist.gov)
- Physical Constants (physics.info)
- Atomic Masses (www.angelo.edu)
- List of elements by atomic properties (en.wikipedia.org)

### Space

- Astronomical Constants PDF (asa.usno.navy.mil)
- Planet Compare (solarsystem.nasa.gov)

### Earth

- Earth (en.wikipedia.org)
- Earth Fact Sheet (nssdc.gsfc.nasa.gov)
- How Big Is Earth? (space.com)
- Earth Mass (en.wikipedia.org)
- Earth Radius (en.wikipedia.org)
- Standard Gravity (en.wikipedia.org)

## Units

- Units in VizieR (cdsarc.u-strasbg.fr)
- Units in VizieR (Dimensional Analysis) (cdsarc.u-strasbg.fr)
- SI Units, see: 'Redefining the SI' (www.nist.gov)
- Unit Converter Express Version (www.unitconverters.net)
- Unit Converter App (www.unitconverterapp.com)
- Units in Electricity and Magnetism (www.qsl.net)

- Why metric system uses kilogram as a basic SI unit? (physics.stackexchange.com)

### Systems

- International System of Units (wikiwand.com)
- Non-SI units mentioned in the SI (wikiwand.com)
- Metric system (wikiwand.com)
- United States customary units (wikiwand.com)
- Imperial units (wikiwand.com)
- English Engineering units (en.wikipedia.org)
- Natural Units (www.phys.ufl.edu)

### International System (SI)

- International System of Units (physics.nist.gov)
- Definitions of the SI Base Units (physics.nist.gov)
- SI Prefixes (physics.nist.gov)
- Prefixes for Binary Multiples (physics.nist.gov)
- SI Brochure: The International System of Units (SI) [8th edition] (www1.bipm.org)
- SI Units - International System of Units (www.unitarium.com)
- Tables of SI Units and Prefixes (www.ebyte.it
- SI Derived Unit (en.wikipedia.org)

### Quantities

- Category: Physical Quantities (en.wikipedia.org)
- International System of Quantities (en.wikipedia.org)
- ISO/IEC 80000 (en.wikipedia.org)
- List of Physical Quantities (en.wikipedia.org)
- Radiometry (en.wikipedia.org)
- Luminance (en.wikipedia.org)
- Hitchhiker's Guide to Magnetism by Bruce M. Moskowitz (www.irm.umn.edu)

### Dimensions

- Why radian is dimensionless? (math.stackexchange.com)
- Why are angles dimensionless and quantities such as length not? (physics.stackexchange.com)
- Missing Links - Leeter to IEEE Control Systems Magazine (ieeexplore.ieee.org
- Angle as a Fourth Fundamental Quantity (nvlpubs.nist.gov
- History of Science: Why are the mole and the candela base SI units? (www.quora.com)
- Why is the mole/“amount of substance” a dimensional quantity? (physics.stackexchange.co)
- Why Is There No SI Unit For Information? www.physicsforums.com)
- Why isn't temperature measured in Joules? (physics.stackexchange.com)

### Dimensional Analysis

- Dimensional Analysis (wikiwand.com
- Dimensional Analysis (www.boost.org)
- Conversion of Units of Measurement (www.cs.utexas.edu)

## Other

- Unicode Math Symbols (xahlee.info)