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EXPERIMENT, , Aim, , To determine the density of solid (denser than, water) by using a spring balance and a measuring, cylinder., , Theory, , 1. Density: The density of a substance is, defined as the mass per unit volume,[D=, Here, D = Density of the body, M = Mass of the body, V = Volume of the body., , 2. S.|. unit of density = Kg? or Kg/m?, , 7], , C.g.s. unit of density = g/cm’? or g cm”?

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Weight, , 1. The force due to the gravitational attraction, of the earth that acts on a body is called, weight., , 2. (Weight) Force = mass x acceleration., Force = mass x acceleration due to gravity, (9), , Force = mass xg, , i.e Weight=mxg, 3. Weight of a body = Force on the body., 4. S.|. unit = Newton = 1 kg m/s?, , N =1 kgf= 1 kilogram force,, , i.e g=9.8m/s?, 5. Weight is measured by spring balance., , Materials Required, , A spring balance, a measuring cylinder, a beaker, with water, a metal bob (or any body that is, heavier than water and does not dissolve in, water), a cotton string, a stand (optional).

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Procedure, , 1. Tie a metal bob (or any solid) with the string, of cotton to the hook of the spring balance., The spring balance should be checked for, any error. Let the zero error be ‘x’., , 2. Hold the spring balance (or tie it to the, stand), suspended with the metal bob in air., Measure the weight of the bob. Let its, weight be ‘Wr’, , 3. Pour the water in the measuring cylinder and, record the initial volume of water, let it be, V1, , 4. Suspend the metal bob into the measuring, cylinder with water. The bob should not, touch the base, nor the sides of the cylinder., The water level rises, measure the increased, water level, let this volume be‘ Ve’, , 5. Record all your observations in the, observation table and do the calculation to, find the density of a given solid metal bob.

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Final volume of water, , , , 23, i, , Measuring cylinder, , , , , , , , , , IMT, 288g, , , , Zero error

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Observations, , WEIGHT OF THE SOLID (METAL BOB) (M), , , , Initial Reading of Final Reading of spring Weight of the Metal Bob, Spring balance, x balance with Metal Bob (W,) W-=wW,-x, 0 400 400, , , , , , , , , , , , 1. Weight of the given Metal Bob = 400N, 2. Mass of the Metal Bob = 400/9.8 = 40.8 g, , VOLUME OF THE SOLID (METAL BOB) (V), , , , , , Initial Volume of water in Final volume of water when Volume of the Metal Bob, cylinder V, (mL) Metal Bob is immersed V, (mL) Vn Vy=V,, 40 60 20, , , , , , , , , , 1. Volume of water displaced by solid (metal, bob) = 20 mL., , 2. Density of a solid (metal bob) =, g/cm?, , Soae = 2.04, , 1 mL of water = 1 cm?, , Result, , The density of given solid (Metal Bob) is 2.04, g/cm?