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Showing posts from 2022

Why does oil always float on water?

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In a simple experiment, bring a glass of water then add some oil, what do you notice? Yes, they do not mix. what else? The oil will float on water even if you try to stir it, it returns to the top again. Why does oil float on water  In other experiments, such as adding sugar or salt to water they come down to the bottom of the glass and begin to dissolve after a few seconds, this does not happen with oil thanks to the density. Read: why don't oil and water mix What is density: it is the measurement of the mass of an object compared to its volume. simpler definition: it is how heavy are objects compared to their volumes, for example  1 kg of iron vs 1 kg of cork same mass but different volume, iron is way heavier than cork thus iron is more dense than cork.   We find density by the formula:  ρ = mass / Volume The density of water is 1 g/cm³ while oil's is between 0.7 to 0.9 g/cm³, a scientific rule states that the body with less density than the fluid, it floats. So oil floats o

Why did Messi leave Barcelona?

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    On 30 June 2021, Messi became free agent, despite the doubts, it was not a matter of much concern to the fans, everyone was expecting a renewal, Barcelona has been home for the Argentinian since they adopted his talent from a young age, he is number one in the squad indeed, it was a story of loyalty started in 2003. On 5 August 2021, it was officially announced that Messi will leave Barcelona in a real shock for football fans.   Why did Messi leave Barcelona? Barcelona was suffering from serious financial problems and mired in dept, according to many, former president josep Maria Bartomeu bears responsibility for the deterioration of the team which provoked Messi's discontent that made the renewal of his contract questionable, after the departure of Bartomeu, one of the candidates for the presidency of the Catalan club was Joan Laporta, the beloved of the masses who promised Cules to solve the Messi's crisis and end the contract renewal if he won the elections, confid

Why don't we feel Earth move?

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Space contains billions of celestial bodies including our planet, the Earth. Everything in space moves, the Earth rotates on its axis every 24 hours at speed of 460 m/s and around the sun every 365.25 days at speed of 100k km/h. However we don't feel Earth move and everything seems to be still, this is probably what made the ancients believe the planet is stationary, but later science proved that all celestial bodies spin: stars, moons, planets and galaxies. Why don't we feel Earth move It is possible to prove the Earth's orbit on its axis by the succession of night and day, where the side facing the sun causes day and the other side is night and during the rotation the sides change and so on, If the planet were stationary, it would be day or night on each side forever.    The rotation of the earth around the sun can be inferred by the change of the four seasons as a result of the tilt of the Earth's axis. But how come we don't actually feel earth's

Why does leap year occur

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  Leap year is a little bit confusing, regularly years consist of 365 days but when leap year occurs, it has additional day making it totally 366 days, Though all that confusion it is not that complicated. Why does leap year occur ,It takes the Earth 365 days and about 6 hours to complete an orbit around the sun, this could cause an error if the 6 hours are not added in some way, this means that the calendar will start a new year 6 hours before the Earth's rotation around the sun. Julius Caesar was who invented "leap year" idea when he made a huge changes in the calendar, he decided to add an extra day every 4 years (6+6+6+6=24: 1 day), February is the month that increases probably because it is the shortest, later Gregorian calendar added more accurate edits. Leap year occurs every 4 years, it has to be perfectly dividable to 4 such as 2000, 2004, 2008... Note that years which are dividable to 100 but not to 400 like 1800 are not leap years. Last leap year: 2020 Next one