Atmospheric pressure is observed (measured) to the nearest tenth of a mbar or a tenth of a hPa.. That's five digits. Standard atmospheric pressure is 1013.25 mbar or 101.325 kPa or 1013.25 hPa.
Hope this clarifies. Stan Doore ----- Original Message ----- From: "Terry Simpson" <[EMAIL PROTECTED]> To: "U.S. Metric Association" <[EMAIL PROTECTED]> Sent: Sunday, September 07, 2003 5:21 PM Subject: [USMA:26894] Re: Non-SI metric units G. Stanley Doore wrote: >Four-digit millibar pressure reports don't report the least >significant digit of atmospheric observations now. I am not sure what you mean. >TV weather people report pressure to two decimal places in inches >of Hg after conversion from tenths of millibars. Tenths of millibars appear to be unique to North America. They may merely be provided to support conversion to inches. Drop the inches and you can drop the tenths of millibars. See how Britain shows the pressure over Europe: http://www.met-office.gov.uk/weather/charts/animation.html >So why not use and report kPa to two decimal places Why have two when one is enough?
