FREE ESSAY ON TRIPLE BEAN BALANCE

TRIPLE BEAN BALANCE

TRIPLE BEAM BALANCE
The triple beam balance is a rugged, inexpensive weighing instrument. It is named for the
three beams which carry weights.A. The middle beam reads only in 100 g increments.B. The
far beam reads only in 10 g increments.The weights in each of these must always sit in a
notch. They cannot be placed at arbitrary points on the beam.C. The weight on the front
beam can be placed to read continuously from 0 to 10 grams. 
The Triple Beam Balance is a typical mechanical balance.It has a beam which is supported
by a fulcrum. On one side is a pan on which the object is placed. On the other side, the
beam is split into three parallel beams , each supporting one weight. In measuring the
weight of an object, rather than adding additional weights, each of the three weights can
be slid along the beam to increase their lever arm.It works just like a tetter-totter. If
you have two people of unequal weight, the heavier person sits closer to the fulcrum to
decrease their lever arm.
Making a WeighingIn measuring the mass of any material ,you must always
make............................................. two weighings!If you use a container to
hold the material, you must first weigh the empty container. This weight is called the
tare of the container. Then you weigh the container with the material in it. The
difference between these two weighings is the mass of the material.In weighing an object
directly on the pan, you must still make two weighings. The first of these is to weigh
the empty pan! This must be set to read 0.00 g. The triple beam balance has a little knob
under the pan which you screw in or out to set the empty balance to read exactly 0.00
g.So, in weighing an object directly on the pan, you must first Zero the balance. Only if
the balance is properly zeroed, will it weigh the object correctly.
The front beam is graduated in one gram units 0-10 (see numbers). Each one gram interval
is further divided into 10 spaces or .1 gram. When the weight is carefully placed, its
position can be estimated to .01 or .02 g.In reading any graduated scale....You read not
only to the smallest graduation mark but estimate between the graduation marks.This is
called reading the scale to the proper number of Sig Figs.