3 ms·

You could add GeV/c2 (giga-electronvolts per speed of light squared) as a unit of weight that is used by physicists for sub-atomic particle mass.

by ocrow 3y ago

KodyBerns99 3y ago
Thank you, I will definitely add it.
chrismorgan 3y ago
As an example of a completely different approach, this works out of the box in GNU units (showing both noninteractive and interactive usage): $ units GeV/c^2 Definition: 1.7826619e-27 kg $ units Currency exchange rates from FloatRates (AUD base) on 2023-06-21 3761 units, 113 prefixes, 120 nonlinear units You have: GeV/c^2 You want: [leave it blank] Definition: 1.7826619e-27 kg You have: Because of these various definitions (a selection of lines pulled from /usr/share/units/definitions.units, I think I have included all the relevant ones recursively): G- giga giga- 1e9 # Greek gigas, "giant" e 1.602176634e-19 C # electron charge (exact) C coulomb coulomb A s # charge A ! # The ampere, symbol A, is the SI unit of electric current. […] s ! # The second, symbol s, is the SI unit of time. It is defined […] V volt volt W/A # potential difference W watt watt J/s # power J joule joule N m # energy N newton newton kg m / s^2 # force kg ! # The kilogram, symbol kg, is the SI unit of mass. It is […] m ! # The metre, symbol m, is the SI unit of length. It is […] c 299792458 m/s # speed of light in vacuum (exact) (Fun thing, kg being the SI unit. Because of this, gram is defined as millikg!) I really like the approach of specifying what you have, in absolutely whatever unit you like, and what you want (though I omitted that argument in this case, to just have it show the definition), and having it resolve it. An excerpt from my ~/.units (which does have some serious stuff in it too, honest): # Why not? (Question: is the slightly-Welsh-sounding ygazillion, yocto-gazillion, 10⁻²⁴ gazillion, greater or less than one?) gazillion ! elephant 6.35 tonne elephant_african 6.35 tonne elephant_asian 5 tonne # I want to have ranged values: elephant_baby 90–135 kg. This get complicated because of non-linear transformations, e.g. 2^(1–10) = 2–1024, but log₂-biased. # baby_grand is also a baby

You could add GeV/c2 (giga-electronvolts per speed of light squared) as a unit of weight that is used by physicists for sub-atomic particle mass.

by ocrow 3y ago

You could add GeV/c2 (giga-electronvolts per speed of light squared) as a unit of weight that is used by physicists for sub-atomic particle mass.

KodyBerns99 3y ago

Thank you, I will definitely add it.

chrismorgan 3y ago

As an example of a completely different approach, this works out of the box in GNU units (showing both noninteractive and interactive usage): $ units GeV/c^2 Definition: 1.7826619e-27 kg $ units Currency exchange rates from FloatRates (AUD base) on 2023-06-21 3761 units, 113 prefixes, 120 nonlinear units You have: GeV/c^2 You want: [leave it blank] Definition: 1.7826619e-27 kg You have: Because of these various definitions (a selection of lines pulled from /usr/share/units/definitions.units, I think I have included all the relevant ones recursively): G- giga giga- 1e9 # Greek gigas, "giant" e 1.602176634e-19 C # electron charge (exact) C coulomb coulomb A s # charge A ! # The ampere, symbol A, is the SI unit of electric current. […] s ! # The second, symbol s, is the SI unit of time. It is defined […] V volt volt W/A # potential difference W watt watt J/s # power J joule joule N m # energy N newton newton kg m / s^2 # force kg ! # The kilogram, symbol kg, is the SI unit of mass. It is […] m ! # The metre, symbol m, is the SI unit of length. It is […] c 299792458 m/s # speed of light in vacuum (exact) (Fun thing, kg being the SI unit. Because of this, gram is defined as millikg!) I really like the approach of specifying what you have, in absolutely whatever unit you like, and what you want (though I omitted that argument in this case, to just have it show the definition), and having it resolve it. An excerpt from my ~/.units (which does have some serious stuff in it too, honest): # Why not? (Question: is the slightly-Welsh-sounding ygazillion, yocto-gazillion, 10⁻²⁴ gazillion, greater or less than one?) gazillion ! elephant 6.35 tonne elephant_african 6.35 tonne elephant_asian 5 tonne # I want to have ranged values: elephant_baby 90–135 kg. This get complicated because of non-linear transformations, e.g. 2^(1–10) = 2–1024, but log₂-biased. # baby_grand is also a baby