Be sure and write Mazda to tell them.
On Tue, 24 Apr 2007 20:45:22 -0400, Bill Hooper wrote > On 2007 Apr 23 , at 7:21 PM, Brian White wrote: > > > Har har. :) (pressure unit) kg/cm2. Typo. > > > > On Mon, 23 Apr 2007 19:11:07 -0400, Pierre Abbat wrote > >> On Monday 23 April 2007 14:04, Brian White wrote: > >>> I opened my Miata cluster to remove the L - H oil pressure gauge > >>> for one > >>> that read kg/cm3. > > Both are technically wrong because they use the kilogram as a unit > of force. The unit of force in SI is the newton, not the kilogram. > The kilogram is a unit of mass in SI. > > Yes, I understand that when someone refers to a kilogram of force > > (kgf) they mean the weight of a kilogram of mass under "normal" gravity. > > One pound of mass is defined as the mass whose weight force is 1 > pound of force. > "Normal" gravity is 9.81 N/kg, so a pressure > of 1 kgf/cm^2 is 9.81 N/cm^2 > which equals 9.81 x 10^4 N/m2 > which is the same as 9.81 x 10^4 Pa (pascals) > and that is the same as 98.1 kPa (kilopascals) > > We do the same when we use pound as both a force and a mass unit in > Ye Olde Enlgish mix of units. Either one leaves open the question of > what is "normal" gravity when we are measuring things in space, on > the moon, on Triton or Mars. etc. > > However, the pound mass and the pound weight cannot be > simultaneously used to form a simple and coherent system of units, > just as a kilogram of mass and a kilogram of force cannot. In SI > the kilogram is ONLY a mass unit and the force unit is the newton. > > Bill Hooper > 1810 mm tall > Fernandina Beach, Florida, USA > > ========================== > SImplification Begins With SI. > ==========================
