On Friday 11 February 2005 14:14, [EMAIL PROTECTED] wrote:
> 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
Dividing by 7.5 mentally is a bit tough for many people. I find it a
bit
easier to multiply by 4 then divide by 30 (divide by three then move the
decimal point left one position). With a systolic pressure of 120 mmHg one
multiplies by 4 to get 480, divides by 3 to get 160, and moves the decimal
point to get 16. For a typical diastolic pressure,
75 --> 300 --> 100 -->10
Jim
--
James R. Frysinger
Lifetime Certified Advanced Metrication Specialist
Senior Member, IEEE
http://www.cofc.edu/~frysingj
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