PHY100H5 Lecture Notes - Lecture 2: Photosynthesis, Materialism, Brownian Motion
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Matter is anything that takes up space. De(cid:373)o(cid:272)(cid:396)itus (cid:894)~4(cid:1004)(cid:1004) bce(cid:895): all (cid:373)atte(cid:396) us (cid:373)ade up of s(cid:373)all, i(cid:374)(cid:448)isi(cid:271)le pa(cid:396)ti(cid:272)les, ato(cid:373)s (cid:894)g(cid:396)eek fo(cid:396) (cid:862)i(cid:374)di(cid:448)isi(cid:271)le(cid:863)(cid:895) If (cid:455)ou keep di(cid:448)idi(cid:374)g a su(cid:271)sta(cid:374)(cid:272)e, the(cid:396)e is a li(cid:373)it (cid:455)ou (cid:449)ill (cid:396)ea(cid:272)h (cid:449)he(cid:396)e (cid:455)ou (cid:272)a(cid:374)"t di(cid:448)ide it a(cid:374)(cid:455)(cid:373)o(cid:396)e. Einstein (1905) developed a theory for the brownian motion. O(cid:374)e p(cid:396)o(cid:271)le(cid:373) (cid:449)ith dalto(cid:374)"s la(cid:449) (cid:449)as that it stated that ato(cid:373)s (cid:449)e(cid:396)e the smallest unit of matter, when we now know that there are even smaller components of an atom (electrons especially) The irregular (zig-zag) motion of suspended particles observed under microscope. Pollen grain atoms will be hit by the atoms in the molecules of its surroundings. Einstein proved this mathematically (quantitative analysis of the brownian motion) Elements: made of the same kind of atoms (h2 or o2) Molecules: pure substances made of more than one atom (water = h20) Molecules are the building blocks of life: dna and proteins contain thousands or millions of atoms.
