units.si: extras precision for ``u``.

diff --git a/extra/units/si/si.factor b/extra/units/si/si.factor
index 66f7c1e7a7e7d1c8ba4b31e4f4aa68cf380deb28..4ed0459f9f8b2c48909015670e42a509bd8ea2d5 100644 (file)
--- a/extra/units/si/si.factor
+++ b/extra/units/si/si.factor
@@ -73,7 +73,7 @@ IN: units.si
 : Np ( n -- neper ) { } { } <dimensioned> ;
 : B ( n -- bel ) 1.151292546497023 * Np ;
 : eV ( n -- electronvolt ) 1.60218e-19 * J ;
-: u ( n -- unified-atomic-mass-unit ) 1.66054e-27 * kg ;
+: u ( n -- unified-atomic-mass-unit ) 1.660539040e-27 * kg ;
 
 ! au has error of 30m, according to wikipedia
 : au ( n -- astronomical-unit ) 149597870691 * m ;