The principle, dubbed as the equation of flow , describes how the velocity of a substance changes as it flows through a channel. Essentially, it declares that for an uniform liquid, the mass flow rate remains unchanged along a direction. Mathematically, this translates expressed as A₁V₁ = A₂V₂,

Before contemporary methods of organizing elements, scientists faced challenges in the known elements. One early attempt was made by Johann Wolfgang Döbereiner, a German chemist who noticed a striking pattern among certain groups of chemicals. He proposed that three elements with similar properti