Someone is doing simple experiment \"Making of A Simple Hydrometer\". The experi

Question

Someone is doing simple experiment "Making of A Simple Hydrometer". The experiment is done with simple tools and materials:

a. Long Straw

b. Clay/Wax

c. Sands

d. Markers

e. Water

f. Salts

g. Container

The steps of the experiment is as follows:

a. Straw is marked by markers at 2/3 of the straw or 15-20 cm from lower end of the straw

b. At the lower end of the straw, put the clay to seal the straw

c. Straw is dipped into the water filled container then add sands until the mark on straw is in parallel with water surface

d. The simple hydrometer is made

e. The simple hydrometer is used to measure density of NaCl with concentration of 0.05 gram/ml.

Question:

a. What happen to the hydrometer? How's the hydrometer position when dipped to the NaCl solution?

b. How can the phenomena happen? Give explanation

Explanation / Answer

Archimedis principle says that upward buoyant force on the body is equal to the weight of the displaced fluid.

weight of the fluid displaced by the hydrometer is equal to the weight of the hydrometer.since buoyant force equals the weight of the hydrometer for the system to be in equilibrium.

hence,in more denser fluid (nacl sol) volume of the fluid to be diplaced which equals the weight of the hydrometer is lesser.

therefore,hydrometer mark will be above the surface of the fluid

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