Units gets density of water wrong +Fix
David Hull
david at wiley.UUCP
Tue Apr 12 12:21:21 AEST 1988
Index: /usr/lib/units 4.2BSD Fix
Description:
The entry for water in /usr/lib/units is wrong for 4.2BSD. The
same error also exists in SunOS 3.4 and Ultrix 2.0.
Repeat-by:
Find the density of mercury compared to water or convert
atmospheric pressure to feet of water.
%units
you have: mercury
you want: water
* 1.505660e+06
/ 6.651608e-07
you have: atm
you want: feet water
* 3.754279e+06
/ 2.663627e-07
Mercury is around 13 times as dense as water and one atmosphere
is around 30 feet of water.
Fix:
Compute what water should be:
water = density * gravity
= (1 gm / cm^3) * g
= (1000 kg / m^3) * g
= 9800 kg / (m^2 * sec^2)
But it's better to leave it in terms of g, which is defined more
accurately than 9.8 m/sec^2.
%units
you have: mercury
you want: water
* 1.359506e+01
/ 7.355613e-02
you have: atm
you want: feet water
* 3.389854e+01
/ 2.949980e-02
*** /usr/src/usr.bin/units.lib Thu Sep 25 11:49:39 1986
--- /usr/lib/units Mon Apr 11 16:24:26 1988
***************
*** 509,515 ****
torr mm hg
township 36 mi2
tun 8 barrel
! water .22491|2.54 kg/m2-sec2
wey 40 bu
weymass 252 lb
Xunit 1.00202-13m
--- 509,515 ----
torr mm hg
township 36 mi2
tun 8 barrel
! water 1000g kg/m3
wey 40 bu
weymass 252 lb
Xunit 1.00202-13m
--
---------------------------------------
David Hull TRW Inc. Redondo Beach, CA
...!{uunet,cit-vax,trwrb}!wiley!david
david%wiley.uucp at csvax.caltech.edu
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