水的密度表.doc

最新溫標(biāo)純水密度表在密度計(jì)量測(cè)試中，純水密度是最重要的密度標(biāo)準(zhǔn)參考物質(zhì)，可稱為“第一參考物質(zhì)”。其數(shù)據(jù)對(duì)密度基準(zhǔn)和標(biāo)準(zhǔn)的研究、精密測(cè)試以及在容量、質(zhì)量、流量、壓力、聲學(xué)與海洋計(jì)量等方面都起著基值的作用。迄今國(guó)際間對(duì)于純水密度的研究已有200多年的歷史，主要是研究水密度的絕對(duì)測(cè)量，即通過(guò)確定了標(biāo)準(zhǔn)體(通常為球體)的體積與質(zhì)量參數(shù)的一種間接測(cè)量，準(zhǔn)確度較高，不確定度可110-6；另外就是研究它的熱膨脹，即密度與溫度的關(guān)系，溫度的范圍主要在040之間。眾所周知，密度與溫度參量關(guān)系密切，無(wú)疑溫標(biāo)的改變將直接影響到水密度的數(shù)據(jù)。1990年國(guó)際溫標(biāo)(ITS90)已于1989年由第77屆國(guó)際計(jì)量委員會(huì)議(CIPM)通過(guò)，國(guó)家質(zhì)量技術(shù)監(jiān)督局也于1990年發(fā)布關(guān)于在我國(guó)統(tǒng)一實(shí)行“1990年國(guó)際溫標(biāo)”的通知，并決定從1994年起在全國(guó)實(shí)施新溫標(biāo)。為使計(jì)量、測(cè)試結(jié)果準(zhǔn)確可靠、技術(shù)先進(jìn)，現(xiàn)推薦采用國(guó)際溫標(biāo)(ITS90)的純水密度表來(lái)替代1968年國(guó)際實(shí)用溫標(biāo)(IPTS68)的純水密度表是有實(shí)用價(jià)值的。新表溫度范圍為0100，其中040為常用范圍，溫度間隔為0.1，很多工作不用內(nèi)插計(jì)算，方便實(shí)用；40100的溫度間隔為1，是為了更廣泛使用而編制的。下面給出1990國(guó)際溫標(biāo)水密度表表1990年國(guó)際溫標(biāo)純水密表(kg/m3)t90()0.00.10.20.30.40.50.60.70.80.90999.840999.846999.853999.859999.865999.871999.877999.883999.888999.8931999.898999.904999.908999.913999.917999.921999.925999.929999.933999.9372999.940999.943999.946999.949999.952999.954999.956999.959999.961999.9623999.964999.966999.967999.968999.969999.970999.971999.971999.972999.9724999.972999.972999.972999.971999.971999.970999.969999.968999.967999.9655999.964999.962999.960999.958999.956999.954999.951999.949999.946999.9436999.940999.937999.934999.930999.926999.923999.919999.915999.910999.9067999.901999.897999.892999.887999.882999.877999.871999.866999.880999.8548999.848999.842999.836999.829999.823999.816999.809999.802999.795999.7889999.781999.773999.765999.758999.750999.742999.734999.725999.717999.70810999.699999.691999.682999.672999.663999.654999.644999.634999.625999.61511999.605999.595999.584999.574999.563999.553999.542999.531999.520999.50812999.497999.486999.474999.462999.450999.439999.426999.414999.402999.38913999.377999.384999.351999.338999.325999.312999.299999.285999.271999.25814999.244999.230999.216999.202999.187999.173999.158999.144999.129999.11415999.099999.084999.069999.053999.038999.022999.006998.991998.975998.95916998.943998.926998.910998.893998.876998.860998.843998.826998.809998.79217998.774998.757998.739998.722998.704998.686998.668998.650998.632998.61318998.595998.576998.557998.539998.520998.501998.482998.463998.443998.42419998.404998.385998.365998.345998.325998.305998.285998.265998.244998.22420998.203998.182998.162998.141998.120998.099998.077998.056998.035998.01321997.991997.970997.948997.926997.904997.882997.859997.837997.815997.79222997.769997.747997.724997.701997.678997.655997.631997.608997.584997.56123997.537997.513997.490997.466997.442997.417997.393997.396997.344997.32024997.295997.270997.246997.221997.195997.170997.145997.120997.094997.06925997.043997.018996.992996.966996.940996.914996.888996.861996.835996.80926996.782996.755996.729996.702996.675996.648996.621996.594996.566996.53927996.511996.484996.456996.428996.401996.373996.344996.316996.288996.26028996.231996.203996.174996.146996.117996.088996.059996.030996.001996.97229995.943995.913995.884995.854995.825995.795995.765995.753995.705995.67530995.645995.615995.584995.554995.523995.493995.462995.431995.401995.37031995.339995.307995.276995.245995.214995.182995.151995.119995.087995.05532995.024994.992994.960994.927994.895994.863994.831994.798994.766994.73333994.700994.667994.635994.602994.569994.535994.502994.469994.436994.40234994.369994.335994.301994.267994.234994.200994.166994.132994.098994.06335994.029993.994993.960993.925993.891993.856993.821993.786993.751993.71636993.681993.646993.610993.575993.540993.504993.469993.433993.397993.36137993.325993.280993.253993.217993.181993.144993.108993.072993.035992.99938992.962992.925992.888992.851992.814992.777992.740992.703992.665992.62839992.591992.553992.516992.478992.440992.402992.364992.326992.288992.25040992.212t90()012345678940992.212991.826991.432991.031990.623990.208989.786987.358988.922988.47950988.030987.575987.113986.644986.169985.688985.201984.707984.208983.70260983.191982.673982.150981.621981.086980.546979.999979.448978.890978.32770977.759977.185976.606976.022