The amount of force exerted is directly proportional to the mass of the
object being weighed on a scale. It is also directly proportional to the
local value for the acceleration due to gravity (roughly 9.8 N/kg or 9.8
m/s2) The readout is inscribed or computed to read out in units of mass.
Moving a scale from one location to another may require require
recalibration of that marked-up scale or computation in the case of
high-accuracy scales, due to differences in the local value for the
acceleration due to gravity. W=mg
Jim
Carleton MacDonald wrote:
When you buy something in the produce department you put it on the scale,
which measures the force that gravity exerts on what you are buying ...
Carleton
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of [email protected]
Sent: Monday, February 23, 2009 13:35
To: U.S. Metric Association
Subject: [USMA:43247] Re: discussion of Food Marketing Institute objections
to metric-only labeling option
Carleton,
Grocery stores sell products by mass, by volume, or by count.
They may call mass, volume, and count by other names (residue from the
nineteenth century) but in SI they are mass, volume, and count.
Weight (a force in SI) is *not* an object which can be bought and sold.
Gene.
---- Original message ----
Date: Mon, 23 Feb 2009 17:28:59 +0000 (UTC)
From: [email protected]
Subject: [USMA:43244] Re: discussion of Food Marketing Institute objections
to metric-only labeling option
To: "U.S. Metric Association" <[email protected]>
Cc: "U.S. Metric Association" <[email protected]>
Most grocery stores sell produce by weight. But go
out to a country Farmer's Market and you'll find the
tomatoes, apples, etc. in these little bags or
baskets, all priced by quaint measure such as
"pint", "quart", "peck", "bushel", etc.
--
James R. Frysinger
632 Stony Point Mountain Road
Doyle, TN 38559-3030
(C) 931.212.0267
(H) 931.657.3107
(F) 931.657.3108
