A
Archimedes' Lever
Guest
On Tue, 15 Jun 2010 08:28:30 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
You still fail to differentiate the physical method of measure from the
'scale of units' being reported, and you assume that due to the scale
used, the report must be a measure of mass instead of weight. That is
NOT the case. Just because the scale is graduated in kg does not mean
that it weighs mass. EVER. The physical TYPE of scale is what
determines what is actually being measured. Does the scale compare a
pressure applied against a spring or strip (load cell)with respect to
gravity, or does it compare to the force of a known mass in the same
field of reference at the time of measure?
Even your calibrated spring or load cell based scale only measures
weight, regardless of graduated, calibrated range of operation, due to
said calibration being referenced to gravity's effect on said load cell
or spring.
In other words, the calibration is only good at the bench it is
calibrated on.
Granted, the error is only slight once moved, but it does illustrate
that the reference is to gravity, not mass.
Even a kilogram calibrated bathroom spring OR load cell scale is STILL
only measuring WEIGHT at that altitude, pressure and location on this
globe at which it was calibrated. Move it anywhere and the calibration
reference is off, so the scale is only calibrated for weight from a
gravitational and atmospheric reference point.
Unless it is a balance, one is not measuring mass... ever, even on the
most sensitive 'weight scale'.
A balance scale ALWAYS weighs mass, because it compares the TORQUE
applied to a center tie point between two equidistant arms. The FORCE
the MASSES apply to those arms, and the known calibrated masses used on
the plate resting on one arm, allows us to determine the mass of whatever
is placed onto the plate resting on the other arm based on the amount of
FORCE that mass applies to it.
Bwuahahahahahah! Two birds with one post! TORQUE DOES rely on FORCE
and spring and load cell scales do NOT measure mass.
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:
You still fail to differentiate the physical method of measure from the
'scale of units' being reported, and you assume that due to the scale
used, the report must be a measure of mass instead of weight. That is
NOT the case. Just because the scale is graduated in kg does not mean
that it weighs mass. EVER. The physical TYPE of scale is what
determines what is actually being measured. Does the scale compare a
pressure applied against a spring or strip (load cell)with respect to
gravity, or does it compare to the force of a known mass in the same
field of reference at the time of measure?
Even your calibrated spring or load cell based scale only measures
weight, regardless of graduated, calibrated range of operation, due to
said calibration being referenced to gravity's effect on said load cell
or spring.
In other words, the calibration is only good at the bench it is
calibrated on.
Granted, the error is only slight once moved, but it does illustrate
that the reference is to gravity, not mass.
Even a kilogram calibrated bathroom spring OR load cell scale is STILL
only measuring WEIGHT at that altitude, pressure and location on this
globe at which it was calibrated. Move it anywhere and the calibration
reference is off, so the scale is only calibrated for weight from a
gravitational and atmospheric reference point.
Unless it is a balance, one is not measuring mass... ever, even on the
most sensitive 'weight scale'.
A balance scale ALWAYS weighs mass, because it compares the TORQUE
applied to a center tie point between two equidistant arms. The FORCE
the MASSES apply to those arms, and the known calibrated masses used on
the plate resting on one arm, allows us to determine the mass of whatever
is placed onto the plate resting on the other arm based on the amount of
FORCE that mass applies to it.
Bwuahahahahahah! Two birds with one post! TORQUE DOES rely on FORCE
and spring and load cell scales do NOT measure mass.
