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wjg0302金虫 (正式写手)
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常用英文化学分子式、方程式及数学式的读法
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常用英文化学分子式、方程式及数学式的读法 Na2SO4 Sodium sulphate; C-a-two-S-O-four Mg(OH)2 magnesium hydroxide; M-g-pause-O-H-pause-twice; M-g-in brackets twice Ca2(PO4)3• 2H2O calcium phosphate two hydrate; C-a-two-pause-P-O four-pause- three times-dot-two-H two-O [Zn(NH3)4]2+ tetra-ammonium zinc complex cation ® give; yield; produce, form,become ¬ evolved as a gas; give off a gas ¯ is precipitated; gives X precipitate = reacts revers Cu, D in the precence of a copper as a catalyst on heating CO32- + Ca2+ = CaCO3¯ a carbonate anion with a valancy of two plus a calcium cation with a valancy of two produce a calcium carbonate precipitate R’ R prime R” R double prime, R second prime R1 R sub one 100° C one hundred degrees Centigrade + plus; positive - minus; negative ´ multiplied by; times ¸ divided by ± plus or minus = is equal to; equals º is identically equal to » is approximately equal to ( ) round brackets; parentheses [ ] square brackets { } braces a>>b a is much greater than b a³ b a is greater than or equal to b aµ b a varies directly as b lognX logX to the base n x2 x square, x squared, the square of x Xn X to n factors; the nth power of x; x to the power n x -8 x to the minus eighth power ï xï the absolute value of x the mean value of X the sum of the terms indicated; summation of D x or d x the increment of x dx differential x dy/dx the first derivative of y with respect to x ò integral ¥ infinity 1/2 a half; one half 2/3 two thirds 5/123 five over a hundred and twenty-three eight and three over fourths; eight and three quarters 0.01 O point O one; zero point zero one; nought point nought one 6 % 6 percent 3‰ 3 per mille 2 : 3 the ratio of two to three r=xd r equals x multiplied by d 5´ 2=10 five times two equals ten x3/8=y2 x raised to the third power divided by eight equals y squared (a+b-c´ d)/e=f a plus b minus c multiplied by d, all divided by e equals f y = (Wt-W)/x y equals W sub t minus W over x |
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