Inventions

The invention of the calorimeter

DEFINITION A calorimeter is an apparatus for measuring heat quantities generated in or emitted by materials in processes such as chemical reactions, changes of state, or formation of solutions[1]. INVENTION The French scientists Antoine-Laurent de Lavoisier and Pierre-Simon Laplace invented[2] the calorimeter in 1780 to research the amount of heat released or absorbed by various …

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The invention of the ball-and-stick model

DEFINITION The ball-and-stick model is a molecular model of a chemical substance in which both the three-dimensional position of the atoms and the bonds between them are displayed[1]. INVENTION The German chemist August Wilhelm von Hofmann invented[2] the ball-and-stick model in 1865 in order to better explain the molecular makeup of chemical substances. Initially, he …

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The invention of the multistage rocket.

definition A multistage rocket is a vehicle having two or more rocket units, each operating in turn once its propellant has been exhausted. INVENTION The Chinese philosophers and military strategists Jiao Yu and Liu Ji invented[1] the multistage rocket circa 1350. Here is a description of their multistage rocket which they termed as “fire-dragon issuing …

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