WP-34S galUS-> l Precision

[Claudio L.]

(12-15-2016 04:49 PM)John Keith Wrote:  Thanks for posting this very useful info. I am glad to see the increased precision available for the WP-34S.

Interestingly, your high-precision results seem to be mostly identical to the built-in conversion factors in the HP-4X series except, of course, for the 16 digit precision. However, I have found a few discrepancies between your high-precision results and those given by the HP-50g. I am not sure on which side(s) the errors lie, but I wanted to bring the discrepancies to your attention.

The following are the HP-50's definitions which are different from the ones you listed:

Code:


1 galUK = 4.546092 l
1 flozUK = 28.413075 g (based on galUK above)
1 pc = 3.08567818585E13 km
1 l. y. = 9.46052840488E12 km
1 mm Hg = 133.322368421 Pa

This is not necessarily an exhaustive list, just the ones I noticed while poking around.

John

The 50 uses the same definitions as the 48 series, which are quite old.
For example, the UK gallon was redefined in 1985 to match the Canadian gallon. The 50g uses the old definition, while the new one is exactly 4.54609 l, so it's been already 31 years since that definition was changed. It's time for an update.
The Parsec and light year depend on the definition of the light speed, which has remained fixed since 1983.
The mmHg depends on the standard atmosperic pressure, and the standard acceleration of gravity, which also were redefined some time ago.