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IMAGINE tRYING tO live in a ed by di aste or smell and is so variable in its properties t it is generally benign but at otimes sly lets state, it can scald you or freeze you. In tain organic molecules it can form carbonic acids so nasty t trip trees and eat tatuary. In bulk, ed, it can strike no and. Even for to live , it is anoften murderous substance. e call it er.
ater is everyo is 80 percent er, a co, a bacterium 75percent. A tomato, at 95 percent, is little but er. Even er,making us more liquid t to one. ater is strange stuff. It isformless and transparent, and yet o be beside it. It aste and yet aste of it. e ravel great distances and pay small fortunes to see it in suns is dangerous and droens of t to frolic in it.
Because er is so ubiquitous end to overlook raordinary substance it is.
Almost not it can be used to make reliable predictions about ties of oter and based your assumptions on t co it—ably—you it to boil at minus 135 degrees Fa and to be a gas at roomtemperature.
Most liquids by about 10 percent. ater does too, but only doo apoint. Once it is ance of freezing, it begins—perversely, beguilingly,extremely improbably—to expand. By time it is solid, it is almost a tent expands, ice floats on er—“an utterly bizarreproperty,” according to Jo lacked ttom up. it surface ice to in,ter’s e a even cing yet more ice.
Soon even t certainly stay t ime,probably forever—ions to nurture life. ter seemsunary or laws of physics.
Everyone kno er’s c it consists of onelargisom taco it. tomscling fiercely to t, but also make casual bonds er molecules.
ture of a er molecule means t it engages in a kind of dance ermolecules, briefly pairing and tners in a quadrille,to use Robert Kunzig’s nice per may not appear terribly lively, but everymolecule in it is cners billions of times a second. t’s ick togeto form bodies like puddles and lakes, but not so tig t be easilyseparated as o a pool of t any given moment only 15
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