Hare's Apparatus

Aim: To determine the density of a liquid miscible with water.

Apparatus required: Hare's apparatus, water, liquid.

Principle: Relative density of the liquid = h1/h2. 9(Refer figure)

Density of the liquid = Relative density x density of water

Procedure: One limb of the Hare's apparatus is dipped into beaker of water and the other into a beaker containing the liquid whose density is to be measured. Air is sucked out of the apparatus through the tube 'P' till liquids have risen to suitable heights. Using a clip the tube 'P' is closed. The heights 'h1' and 'h2' are noted. From this density of the liquid can be calculated.

Kundt's tube

Aim: To determine the velocity of sound in a rod

Instruments required: kundt's tube, Lycapodium powder, resined leather.

Procedure: Kundt's tube is a glass tube. Lycapodium powder is introduced in to kundt's tube with the help of a scale. A rod is then introduced to the tube. This rod is clamped exactly at the midpoint. The free end of the rod is stroked longitudinally using a piece of resined leather. A very shrill sound is produced. Use the piston to form well defined lycopodium powder loops. Length of the loop(l) is measured. If 'L' is the length of the rod and 'v' the velocity of sound in air, then velocity of sound in rod = vxl/L.