Alexa&Carla<3Stan

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Shyanne was hurrr. lubbbb you guys<3
 * 1) History of the Atom (5pts)
 * 2) Find out the important scientists who contributed to our current knowledge of the atom. Include:
 * A picture.
 * When they lived.
 * What they did.


 * Find out the important experiments that were used to make breakthrough discoveries.
 * Who perfomed these experiments?
 * Include years of each discovery/experiment so we can get an idea of how long this process has taken.

= ﻿Anwser: John Dalton =

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He was born September 6th 1776 and deceased July 27 1844.======

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He was born into a quaker family in Cumberland, England. He was a meterologist, English chemist and a physicist. He's best known for his contributuion to the atomic theory and research on colour blindness.======

Atomic theory
In 1800, Dalton became a secretary of the Manchester Literary and Philosophical Society, and in the following year he orally presented an important series of papers, entitled "Experimental Essays" on the constitution of mixed gasses, the pressure of steam and othervapors at different tempatures, both in a and in air; on evaporation; and on the therma epasinf gases. These four essays were published in the //Memoirs// of the Lit & Phil in 1802. The second of these essays he says , There can scarcely be a doubt entertained respecting the reducibility of all elastic fluids of whatever kind, into liquids; and we ought not to despair of affecting it in low temperatures and by strong pressures exerted upon the unmixed gases further.

After describing experiments to ascertain the pressure of steam at various points between 0 and 100 °C (32 and 212 °F), Dalton concluded from observations on the vapour pressure of six different liquids, that the variation of vapour pressure for all liquids is equivalent, for the same variation of temperature, reckoning from vapour of any given pressure. In the fourth essay he says, I see no sufficient reason why we may not conclude that all elastic fluids under the same pressure expand equally by heat and that for any given expansion of mercury, the corresponding expansion of air is proportionally something less, the higher the temperature. It seems, therefore, that general laws respecting the absolute quantity and the nature of heat are more likely to be derived from elastic fluids than from other substances.