Essay on archimedes principle

In part B of the experiment, we were able to determine the change in mass of the lead rod from the air to the water and the volume of the lead rod. After modifying the formula to solve for mass, we were able to find the change in mass for each trial by multiplying the spring constant and displacement of the lead rod in air versus water, then dividing by gravity.

The average change in mass was found to be 9. Once we had found the mass of the lead rod, we were able to find calculate the volume of the lead rod by modifying the buoyancy force formula to solve for the volume of the object. Find that formula, we divided the mass of the lead rod by the density of water as shown in the table of literature.

The average volume of the lead rod was found to be 3. In part C of this experiment, we were able to determine the change in mass of the lead rod from air to an unknown liquid and the density of the unknown liquid. We used the same method in part B to calculate the change in mass of the lead rod. The average change in mass of the lead rod in the unknown liquid was found to be … Since the volume of an object does not change when submerged in various liquids, we were able to use the average volume of the lead rod found in part B.

Average density of the unknown liquid was found to be 1. Since the unknown liquid had an aroma of rubbing alcohol, we hypothesized that the unknown liquid was a mixture of rubbing alcohol and water. Using Archimedes principle, our hypothesis can be supported since the average density of the unknown liquid was 0. An alternative method for this experiment would be to set up the beaker so that the liquid level would be completely leveled, versus when a person lifts the beaker with an unleveled liquid level.

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A way a person could do this would be to place a book under the beaker with a leveled liquid level, so that the lead rod is equally and fully submerged in the liquid. Conclusion: The objective of this experiment was to determine the mass and volume of an object and the density of an unknown liquid using Archimedes Principle.

For part A, we used the spring constant from the previous lab to help determine the mass of the lead rod in part B. The displacement of the lead rod from the air to the water was found in order to help determine the average mass of the lead rod. The average change in mass of the lead rod from air to water was 9. The average volume of the lead rod was 9. In part C an unknown liquid was used. A similar method was used to determine the average change in mass of the lead rod in the unknown liquid, which was found to be 7. Some historians believe his death was due to Archimedes not willing to give up his mathematical diagrams of mirrors that would burn the Roman ships.


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Archimedes father was named Phidias who was an astronomer. There are currently not many documents of Archimedes upbringing. In fact there is only one record of his life that was written by his friend Heracleides.

Unfortunately this biography was lost. Education Archimedes was not only a mathematician but also a physicist, engineer, inventor, and astronomer Applications of Archimedes ' Principle 1. Submarine: A submarine has a large ballast tank, which is used to control its position and depth from the surface of the sea. A submarine submerges by letting water into the ballast tank so that its weight becomes greater than the buoyant force and vice versa. It floats by reducing water in the ballast tank. Hot-air balloon The atmosphere is filled with air that exerts buoyant force on any object.

A hot air balloon rises and floats due to the buoyant force when the surrounding air is greater than its weight.

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It descends when the balloon weight is more than the buoyant force. The weight of the Hot-air balloon can be controlled by varying the quantity of hot air in the balloon. Hydrometer A hydrometer is an instrument to measure the relative density of liquids. It consists of a tube with a bulb at one end. Lead shots are placed in the bulb to weigh it down and enable the hydrometer to float vertically in the liquid. In a liquid of lesser density, a greater volume of liquid must be displaced for the buoyant force to equal to the weight of the hydrometer so it sinks lower. Hydrometer floats higher in a liquid of higher density.

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Density is measured in the unit of g cm SHIP A ship floats on the surface of the sea because the volume of water displaced by For the density of solids, they had made use of spring balance to measure the mass of the metal samples, which were tied via string, in air and when immersed inside a mL beaker, where H2O lies. As for the density of liquids, they had filled a graduated cylinder with mL liquid sample and had immersed a hydrometer.

They had immersed a sample metal in the liquid sample and had measured its mass in air and beneath the liquid. They had been successful to support the theory of Archimedes and had came up with percentage error ranging from 5. Main idea: Buoyancy of an object is determined by properties of the object as well as properties of the fluid surrounding it.

Pressure at bottom greater than at top A substance that is able to take the shape of any container that holds it.

Archimedes' Principle

If a density is less than that of water or the liquid it is floating in acts against buoyant force A buoyant force on an object is equal to the weight of the fluid displaced by the object. See Terms of Use at www. Sign Up.

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