Question

You have wanted to become a "barista". In order to practice at home, you recently bought a new coffee machine. You already knew how to make "Americano", which is usually made by mixing Espresso with water. One day, when you turned on the coffee machine to make Americano in the morning, interestingly, you brought up a question: "Which one should be first? Water or Espresso?" So, you decided to test the taste of Americano by switching mixing procedure. Firstly, you prepared two cups of Espresso and two cups of water.Let's assume that two liquids are directly contacted to each other in the initial state. Therefore, you can ignore a velocity and a force by twisting your wrist in order to pour a liquid to the other, i.e., only gravitational force will be applied to liquids. You tested two cases that put Espresso on water and vice versa (see the below figure)

This is about Earth & Environmental transfer phenomen.! Respect to Fluid mechanics! Please give me great answer.!
Please write neatly..! (No script)

Answer 1

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