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In 1800 he 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 gases; on the pressure of steam and other vapours at different temperatures, both in a vacuum and in air; on evaporation; and on the thermal expansion of gases. These four essays were published in the Memoirs of the Lit & Phil in 1802. The second of these essays opens with the striking remark, 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), he 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 remarks,

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14y ago
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13y ago

Got your answer right here:

http://dl.clackamas.edu/ch104-04/dalton's.htm

Hint: Law of ......

he said that atoms are the smaller things and it is wrong he said that two different atoms can unite to forma a compound which is true and also said that atoms where spheres...

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11y ago

John Dalton was the one that brought forword a theory known today as daltons atomic theory

it states

  1. Elements are made of extremely small particles called atoms.
  2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
  3. Atoms cannot be subdivided, created, or destroyed.
  4. Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
  5. In chemical reactions, atoms are combined, separated, or rearranged
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11y ago

John Dalton developed the first modern atomic theory.

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12y ago

Atomic theory

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14y ago

atomic theory

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Q: What is the contribution of John Dalton to atomic theory?
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