Differences

This shows you the differences between two versions of the page.

--- manual:chapter3:units [2019/09/14 15:11]
jojo1973 Added "Multiples and Submultiples" section
+++ manual:chapter3:units [2019/11/19 13:23]
claudio [Multiples and Submultiples]
@@ Line 25: / Line 25: @@
 ==== Multiples and Submultiples ====
-Multiples and submultiples of any unit (with some exceptions) are obtained by prefixing them with the standard SI prefixes. Therefore, ''1_dal'' is equivalent to ''10_l'' and ''3.5_MHz'' is equivalent to ''3500000_Hz''.
+Multiples and submultiples of many units are obtained by prefixing them with the standard SI prefixes. Therefore, ''1_dal'' is equivalent to ''10_l'' and ''3.5_MHz'' is equivalent to ''3500000_Hz''.
-There is only one exception: prefixes can't be used if the resulting name matches an already existing unit. For example, it's not possible use ''_[min]'' to mean milliinches because ''_[min]'' is already defined and corresponds to the time unit "minute".
+SI prefixes can be used with all SI units and many non-SI units where SI prefixes are common usage. Other non-SI units do not accept prefixes.
 ^  SI Prefix  ^  Factor  ^  Name  ^
@@ Line 77: / Line 77: @@
 ==== Available Units ====
-This is a list of the units available in the ''Units'' menu on newRPL:
+This is a list of the units available in the ''Units'' menu on newRPL. All the conversion factors are meant to be exact, not approximated.
-| **Length** ||||
+=== Length ===
-| Unit | Unit name | Definition | Description |
-| 1_m | metre | 1_m  | Base SI unit of length |
+^ Unit ^ Unit name ^ Definition ^ Description ^ Prefixable ^
-| 1_cm | centimetre | 1_cm = 0.01_m | SI length |
+| 1_m | metre | 1_m  | Base SI unit of length | {{fa>check?lg&color=green}} |
-| 1_mm | millimetre | 1_mm = 0.001_m | SI length |
+| 1_cm | centimetre | 1_cm = 0.01_m | SI, metric | {{fa>times?lg&color=red}} |
-| 1_yd | yard | 1_yd = 3_ft | US customary length |
+| 1_mm | millimetre | 1_mm = 0.001_m | SI, metric | {{fa>times?lg&color=red}} |
-| 1_ft | foot | 1_ft = 12_in | US customary length |
+| 1_yd | yard | 1_yd = 3_ft | US Customary | {{fa>times?lg&color=red}} |
-| 1_in | inch | 1_in = 0.0254_m | US customary length |
+| 1_ft | foot | 1_ft = 12_in | US Customary | {{fa>times?lg&color=red}} |
-| 1_Mpc | megaparsec | 1_Mpc = 1000000_pc | Astronomical length |
+| 1_in | inch | 1_in = 0.0254_m | US Customary | {{fa>times?lg&color=red}} |
-| 1_pc | parsec | 1_pc = (648000/π)_au | Astronomical length |
+| 1_Mpc | megaparsec | 1_Mpc = 1000000_pc | Astronomical length | {{fa>times?lg&color=red}} |
-| 1_lyr | light year | 1_lyr = 365.25_d*c | Astronomical length |
+| 1_pc | parsec | 1_pc = (648000/π)_au | Astronomical length | {{fa>times?lg&color=red}} |
-| 1_au | astronomical unit | 1_au = 149597870700_m | SI astronomical length |
+| 1_lyr | light year | 1_lyr = 9460730472580800_m | Astronomical length | {{fa>times?lg&color=red}} |
-| 1_km | kilometre | 1_km = 1000_m | SI length |
+| 1_au | astronomical unit | 1_au = 149597870700_m | SI astronomical length | {{fa>times?lg&color=red}} |
-| 1_mi | mile | 1_mi = 5280_ft | US customary length |
+| 1_km | kilometre | 1_km = 1000_m | SI, metric | {{fa>times?lg&color=red}} |
-| 1_nmi | nautical mile | 1_nmi = 1852_m | non-SI length |
+| 1_mi | mile | 1_mi = 5280_ft | US Customary | {{fa>times?lg&color=red}} |
-| 1_miUS | surveying mile | 1_miUS = 5280_ftUS | US surveying length |
+| 1_nmi | nautical mile | 1_nmi = 1852_m | non-SI length | {{fa>times?lg&color=red}} |
-| 1_chain | surveying chain | 1_chain = 66_ftUS | US surveying length |
+| 1_miUS | surveying mile | 1_miUS = 5280_ftUS | US surveying length | {{fa>times?lg&color=red}} |
-| 1_rd | rod | 1_rd =16.5_ft | US customary length |
+| 1_chain | surveying chain | 1_chain = 66_ftUS | US surveying length | {{fa>times?lg&color=red}} |
-| 1_rdUS | surveying rod | 1_rdUS =16.5_ftUS | US surveying length |
+| 1_rd | rod | 1_rd =16.5_ft | US customary length | {{fa>times?lg&color=red}} |
-| 1_fath | surveying fathom | 1_fath =6_ftUS | US surveying length |
+| 1_rdUS | surveying rod | 1_rdUS =16.5_ftUS | US surveying length | {{fa>times?lg&color=red}} |
-| 1_ftUS | surveying foot | 1_ftUS = 1200/3937_m | US surveying length |
+| 1_fath | surveying fathom | 1_fath =6_ftUS | US surveying length | {{fa>times?lg&color=red}} |
-| 1_mil | thousandth of inch | 1_mil = 0.001_in | US customary length |
+| 1_ftUS | surveying foot | 1_ftUS = 1200/3937_m | US surveying length | {{fa>times?lg&color=red}} |
-| 1_µ | micron | 1_µ = 1_µm | SI length |
+| 1_mil | thousandth of inch | 1_mil = 0.001_in | US customary length | {{fa>times?lg&color=red}} |
-| 1_Å | ångström | 1_Å = 0.1_nm | non-SI length |
+| 1_µ | micron | 1_µ = 1_µm | SI length | {{fa>times?lg&color=red}} |
-| 1_fermi | fermi  | 1_fermi = 1_fm | SI length |
+| 1_Å | ångström | 1_Å = 0.1_nm | non-SI length | {{fa>times?lg&color=red}} |
+| 1_fermi | fermi  | 1_fermi = 1_fm | SI length | {{fa>times?lg&color=red}} |
 | **Area** ||||