Why Does Oil Float on Water

What Property of Oil Makes It Float on Water

Oil being less dense than water floats on it. Had it been denser than water like iron, it would have sunk. Density is mass per unit volume. It means that if you take a cubic cm (cc) of oil, its mass is much lesser than a cubic cm of water. It can also be explained by the concept of the buoyant force.

Buoyant Force

The buoyant force is equal to the weight of the water displaced by the oil when the oil is immersed in water. When oil is in water, the buoyant force is much greater than the weight of the oil. Hence it floats.

For example, suppose you want to dissolve 5 cc of oil in water. On adding the oil to water, it displaces 5 cc of water. Now the weight of that much volume of water is much greater than the same volume of oil. So the buoyant force is greater than the weight of the oil. Therefore oil floats on top of water. Continue reading “Why Does Oil Float on Water”

Gold Foil Experiment

Who Did the Gold Foil Experiment?

The gold foil experiment was a pathbreaking work done by scientists Hans Geiger and Ernest Marsden under the supervision of Nobel laureate physicist Ernest Rutherford that led to the discovery of the proper structure of an atom. Also known as the Geiger-Marsden experiment, it was performed at the Physical Laboratories of the University of Manchester between the period 1908 and 1913. Continue reading “Gold Foil Experiment”

Magnetic Monopole

A magnetic monopole is an isolated pole of a magnet that serves as an elementary particle in the field of Particle Physics. It can be either a single North or a single South Pole with a net magnetic charge on it. Its existence is purely hypothetical as according to the magnetic theory, even the smallest part of a magnet comes with two poles, north and south. Still a monopole is essential for defining certain physical quantities and doing calculations in the fields of electromagnetism and magnetism. Continue reading “Magnetic Monopole”

Miller-Urey Experiment

The Miller-Urey Experiment was a landmark experiment to investigate the chemical conditions that might have led to the origin of life on Earth. The scientist Stanley Miller, under the supervision of the Nobel laureate scientist Harold Urey conducted it in 1952 at the University of Chicago. They tried to recreate the conditions that could have existed in the first billion years of the Earth’s existence (also known as the Early Earth) to check the said chemical transformations. Continue reading “Miller-Urey Experiment”

Faraday Cage

A Faraday cage is a covering or mesh-like structure made of a conducting material that shields anything placed inside it from the effect of electric fields. They cannot annul static or slowly varying magnetic fields. However, if the conductor is significantly thick, then they can protect their interiors from external electromagnetic radiation to a large extent. In case the cage is a mesh, the diameter of the holes should be much smaller than the wavelength of the radiation to display the said property.  Continue reading “Faraday Cage”