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From Crofton today the subject is matter.. (number 83)
Matter is another of those areas that I would label 'Scientific' counter intuitively much of matter is space - and that's the case not just in a gas (where it does not feel quite so surprising ) it in even the most dense elements like Iron or Lead.
John Dalton (1766 -1844) looms large in the subject of 'Matter' and came up with theories around 1803 into atomic structure (and also did work regarding Colour Blindness a condition that he and his brother suffered). Although he didn't get it all 'right he did some great pioneering work that he summarised:
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. (wrong John)
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.