Beam balance is used in many stores to measure masses very precisely; the reading error is 0.05 gram.
The physical balance used in the science laboratory is pivoted in the middle with equal arms. The 2 scale pans of equal weights are dangled from the upper edge of wedge shaped supports at either end of the beam. When the beam is increased for weighing, it swings freely about the lower edge of a wedge shaped support in the center. The position the balance is in equilibrium.
Therefore l1 = l2 & m1 = m2, according to the principle of moments,
m1 x l1 = m2 x l2
Now let us place a mass of 1 kg in 1 pan & an unknown mass 'x' on the other pan so that the balance is in equilibrium.
then, (m1 + x) l1 = (m2 + 1) l2
As m1 = m2 and l1 = l2 Therefore x = 1 kg
In our next blog we shall learn about nonmetals I hope the above explanation was useful.Keep reading and leave your comments.
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