unit resistivity per area/length=0A= =0A= resistance has to be ? expressed over a Volume. can you have=0A= dimensionless resistance that is not infinite? I do not see it=0A= =0A= On 9/9/11, mark springer wrote:=0A= > "At 25=B0C the accepted values with their uncertainties for=0A= > conductivity, =EA and its reciprocal, resistivity, =F1, are:=0A= > =EA =3D 0.05501 =B1 0.0001 =ECS/cm at 25.00 =B0C=0A= > =F1 =3D 18.18 =B1 0.03 M=D9=B7cm at 25.00 =B0C"=0A= >=0A= > Standardized Result: 18.18 M=D9=B7cm=0A= > unit resistivity per area/length.??=0A= > http://hypertextbook.com/facts/2006/SamTetruashvili.shtml=0A= >=0A= >=0A= >=0A= >=0A= > On 9/8/11, cdb wrote:=0A= >> I've been looking at the specifications for a domestic water heater and= =0A= >> in=0A= >> the sales bumph they specify the minimum water resistivity required=0A= >> (2K795=0A= >> x inches or 1K1 x cm's). I've never seen such a specification before for= =0A= >> this kind of water heater nor the unit resistivity per area/length.=0A= >>=0A= >> I can find no documents on the interrent apart from those referring to= =0A= >> measurement devices for analytical purposes.=0A= >>=0A= >> Colin=0A= >> --=0A= >> cdb, 8/09/2011=0A= >>=0A= >> --=0A= >>=0A= >>=0A= >>=0A= >>=0A= >> colin@btech-online.co.uk=0A= >>=0A= >> --=0A= >> http://www.piclist.com PIC/SX FAQ & list archive=0A= >> View/change your membership options at=0A= >> http://mailman.mit.edu/mailman/listinfo/piclist=0A= >>=0A= >=0A= =0A= -- =0A= http://www.piclist.com PIC/SX FAQ & list archive=0A= View/change your membership options at=0A= http://mailman.mit.edu/mailman/listinfo/piclist=0A= .