In terms of mental arithmetic shortcuts, it's probably easier to add one third of the value and shift the decimal point.
For a systolic pressure of 120 mmHg, adding 1/3 gives you 160. Shifting the decimal point gives you 16.0, for 16.0 kPa. Bill Potts, CMS Roseville, CA http://metric1.org [SI Navigator] >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >Behalf Of [EMAIL PROTECTED] >Sent: Friday, February 11, 2005 11:14 >To: U.S. Metric Association >Subject: [USMA:32236] blood pressure > > > 2005 Feb 11 >In the matter of torr, mmHg and kilopascal, I am told that >the Chinese convert blood pressure in mmHg to kilopascal kPa >by dividing by 7.5. Try it. It is close. > >SI10 lists mmHg to pascal as multiply by 133.3224. >1000 / 7.5 is 133.333 333 3 which is good enough for my >blood pressure. > >Try barometric pressure. 760 mmHg / 7.5 = 101.333 kPa. >This is rather close. >So, rule of thumb: Divide mmHg by 7.5 to get kPa. > Robert Bushnell PhD PE >
