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比重儀是常用的儀器
 
      常用的(de)(de)(de)(de)比(bi)重(zhong)(zhong)儀有兩種(zhong)。一(yi)種(zhong)用來(lai)(lai)測量密度(du)(du)大(da)于(yu)(yu)1的(de)(de)(de)(de)液(ye)體的(de)(de)(de)(de)密度(du)(du)，稱“比(bi)重(zhong)(zhong)計(ji)(ji)(ji)(ji)”。它(ta)的(de)(de)(de)(de)下(xia)(xia)端(duan)裝的(de)(de)(de)(de)鉛(qian)丸或(huo)水(shui)銀(yin)多一(yi)些(xie)。這(zhe)種(zhong)比(bi)重(zhong)(zhong)計(ji)(ji)(ji)(ji)的(de)(de)(de)(de)*小(xiao)(xiao)刻(ke)度(du)(du)線(xian)(xian)是(shi)“1”，它(ta)在(zai)(zai)標(biao)度(du)(du)線(xian)(xian)的(de)(de)(de)(de)*高處(chu)，由上(shang)而下(xia)(xia)，順次是(shi)、1.1、1.2、1.3……把這(zhe)種(zhong)比(bi)重(zhong)(zhong)儀放(fang)(fang)在(zai)(zai)水(shui)里，它(ta)的(de)(de)(de)(de)大(da)于(yu)(yu)1的(de)(de)(de)(de)標(biao)度(du)(du)線(xian)(xian)，全部(bu)在(zai)(zai)水(shui)面下(xia)(xia)。另一(yi)種(zhong)用來(lai)(lai)測量密度(du)(du)小(xiao)(xiao)于(yu)(yu)1的(de)(de)(de)(de)液(ye)體的(de)(de)(de)(de)密度(du)(du)，稱“比(bi)輕(qing)計(ji)(ji)(ji)(ji)”。它(ta)的(de)(de)(de)(de)下(xia)(xia)部(bu)裝的(de)(de)(de)(de)鉛(qian)丸或(huo)水(shui)銀(yin)少一(yi)些(xie)，這(zhe)種(zhong)比(bi)重(zhong)(zhong)計(ji)(ji)(ji)(ji)的(de)(de)(de)(de)*大(da)標(biao)度(du)(du)線(xian)(xian)是(shi)“1”，這(zhe)個(ge)標(biao)度(du)(du)線(xian)(xian)是(shi)在(zai)(zai)*低處(chu)，由下(xia)(xia)而上(shang)順次是(shi)、0.9、0.8、0.7……把這(zhe)種(zhong)比(bi)重(zhong)(zhong)計(ji)(ji)(ji)(ji)放(fang)(fang)在(zai)(zai)水(shui)里時，它(ta)小(xiao)(xiao)于(yu)(yu)1的(de)(de)(de)(de)標(biao)度(du)(du)線(xian)(xian)全部(bu)在(zai)(zai)水(shui)面上(shang)。使用時，應注意根據液(ye)體的(de)(de)(de)(de)密度(du)(du)大(da)于(yu)(yu)1還是(shi)小(xiao)(xiao)于(yu)(yu)1來(lai)(lai)選用此(ci)重(zhong)(zhong)計(ji)(ji)(ji)(ji)。目前(qian)中(zhong)學課本不(bu)再講(jiang)比(bi)重(zhong)(zhong)單(dan)位而是(shi)講(jiang)密度(du)(du)單(dan)位，但在(zai)(zai)測密度(du)(du)時仍使用比(bi)重(zhong)(zhong)計(ji)(ji)(ji)(ji)，所測數值無大(da)差(cha)異。
      電子比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)計(ji)適用(yong)(yong)于：多孔(kong)性顆(ke)粒/專用(yong)(yong)比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)天(tian)平(ping)(ping)/比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)計(ji)/密(mi)(mi)度(du)(du)計(ji)、水泥業/專用(yong)(yong)比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)天(tian)平(ping)(ping)/比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)計(ji)/密(mi)(mi)度(du)(du)計(ji)、防火材料/專用(yong)(yong)比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)天(tian)平(ping)(ping)/比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)計(ji)/密(mi)(mi)度(du)(du)計(ji)、石材業/專用(yong)(yong)比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)天(tian)平(ping)(ping)/比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)計(ji)/密(mi)(mi)度(du)(du)計(ji)、粉末(mo)理論真密(mi)(mi)度(du)(du)研(yan)究實驗室/專用(yong)(yong)比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)天(tian)平(ping)(ping)/比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)計(ji)/密(mi)(mi)度(du)(du)計(ji)原理：根(gen)據(ju)ASTM C 97-02, GB/T9966.3-2001、G208—94 、217—81規(gui)定(ding)， 采用(yong)(yong)阿基米(mi)得(de)的(de)浸液置換法，配合專用(yong)(yong)比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)瓶和比(bi)(bi)(bi)重(zhong)(zhong)(zhong)(zhong)(zhong)天(tian)平(ping)(ping)，準確(que)的(de)讀(du) 取(qu)量測數(shu)值(zhi)。


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