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Matter is all around us and involves everything tangible a person sees, feels, and touches. The flow of water, the air you breath are examples of matter. There are 3 states of matter,  Solid, Liquid and Gas.

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Long time ago, a philosopher called Democritus was the first person to promote atomism, the idea that an atom is the smallest piece of elements and indivisible by emergence of the scientific method. Atom is something divided into smaller pieces and eventually reaches a point that it can't be further divided.

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Scientists define dark matter as matter in the universe that cannot be observed directly because it emits very little or electromagnetic radiation and experiences little or no directly measurable interaction with ordinary matter.

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Dark Energy is the generic name now being given by astrophysicists and cosmologists to an unknown cosmic force field hypothesised to be responsible for the recently observed acceleration in rate of expansion of the universe.

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Scientists define pressure as force per unit area. The most commonly encountered unit of pressure in the American customary system is pounds-force per square.

Atmospheric pressure plays an important role in many scientific and engineering disciplines. The pressure from the atmospheric