An excited state of anatom,ion,or molecule,that hasa relativelylong lifetime before reverting to the groundstate. Metastable species are intermediates insome reactions.處于激發(fā)態(tài)的原子、離子或分子,在轉(zhuǎn)變?yōu)榛鶓B(tài)前有相對長的壽命。在某些反應(yīng)中,亞穩(wěn)態(tài)物種是中間產(chǎn)物...[繼續(xù)閱讀]

    The spectrum ofthe hydrogen atom is characterized by severalseries of sharp spectral lines described bysimple laws. The general law for these seriesof lines is :氫原子光譜可以通過用簡單定律來描述的幾條尖銳的光譜線來表達。這些譜線遵循的一般定律是:1/λ=R(1/n12-...[繼續(xù)閱讀]

    A unit of pressure equal to onemmHg.In SI units it is equal to 133.322pascals. It was named for Italian physicist E-vangelista Torricelli (1609—47)壓力的一種單位,相當(dāng)于1毫米汞柱。在SI單位制中相當(dāng)于133.322 Pa。用意大利物理學(xué)家E-vangelista Torricelli(1609—1647)的名字...[繼續(xù)閱讀]

    See cyanoferrate參閱167頁cyanoferrate。...[繼續(xù)閱讀]

    See tin參閱582頁tin。...[繼續(xù)閱讀]

    A half cell used formeasuring electrode potentials. The hydrogenelectrode (standard hydrogen half cell) is thebasic standard but,in practice,calomel elec-trodes are usually used用來測量電極電勢的半電池。氫電極(標(biāo)準(zhǔn)的氫半電池)是基本的標(biāo)準(zhǔn)電池,但是實際上,甘汞電池常...[繼續(xù)閱讀]

    A type of battery used invehicles. It has two sets of plates: spongylead plates connected in series to the negativeterminal,and lead(Ⅳ) oxide plates connect-ed to the positive terminal. The material ofthe electrodes is held in a hard lead-alloygrid. The p...[繼續(xù)閱讀]

    The temperature at which aliquid is in equilibrium with its solid phase atstandard pressure and below which the liquidfreezes or solidifies. This temperature is al-ways the same for a particular pure liquidand is numerically equal to the melting pointof t...[繼續(xù)閱讀]

    See clathrate參閱140頁clathrate。...[繼續(xù)閱讀]

    See aluminum ethano-ate.參閱23頁aluminum ethanoate。...[繼續(xù)閱讀]