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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