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1、最新温标纯水密度表在密度计量测试中，纯水密度是最重要的密度标准参考物质，可称为“第一参考物质”。其数据对密度基准和标准的研究、精密测试以及在容量、质量、流量、压力、声学与海洋计量等方面都起着基值的作用。迄今国际间对于纯水密度的研究已有200多年的历史，主要是研窕水密度的绝对测量，即通过确定了标准体(通常为球体)的体积与质量参数的一种间接测量，准确度较高，不确定度可l106;另外就是研究它的热膨胀，即密度与温度的关系，温度的范围主要在O40之间。众所周知，密度与温度参量关系密切，无疑温标的改变将直接影响到水密度的数据。1990年国际温标(ITS90)己于1989年由第77届国际计量委员会议(Cl
2、PM)通过，国家质量技术监督局也于1990年发布关于在我国统一实行“1990年国际温标”的通知，并决定从1994年起在全国实施新温标。为使计量、测试结果准确可靠、技术先进，现推荐采用国际温标(ITS90)的纯水密度表来替代1968年国际实用温标(IPTS-68)的纯水密度表是有实用价值的。新表温度范围为OIO(TC,其中O40C为常用范围，温度间隔为0.1,很多工作不用内插计算，方便实用；40IO(TC的温度间隔为1,是为了更广泛使用而编制的。下面给出1990国际温标水密度表表1990年国际温标纯水密表(kg?)t90()0.00.10.20.30.40.50.60.70.80.9O999.8
3、40999.846999.853999.859999.865999.871999.877999.883999.888999.8931999.898999.904999.908999.913999.917999.921999.925999.929999.933999.9372999.940999.943999.946999.949999.952999.954999.956999.959999.9619.9623999.964999.966999.967999.968999.969999.970999.971999.971999.972999.9724999.972999.972999.97299
4、9.971999.971999.970999.969999.968999.967999.9655999.964999.962999.960999.958999.956999.954999.951999.949999.946999.9436999.940999.937999.934999.930999.926999.923999.919999.915999.910999.9067999.9Ol999.897999.892999.887999.882999.877999.871999.866999.880999.8548999.8999.8999.8999.8999.8999.8999.8999.
5、8999.7999.7484236292316090295889999.781999.773999.765999.758999.750999.742999.734999.725999.717999.70810999.699999.691999.682999.672999.663999.654999.644999.634999.625999.61511999.605999.595999.584999.574999.563999.553999.542999.531999.520999.50812999.497999.486999.474999.462999.450999.439999.426999
6、.414999.402999.38913999.377999.384999.351999.338999.325999.312999.299999.285999.271999.25814999.244999.230999.216999.202999.187999.173999.158999.144999.129999.11415999.099999.084999.069999.053999.038999.022999.006998.991998.975998.95916998.943998.926998.910998.893998.876998.860998.843998.826998.8099
7、98.79217998.774998.757998.739998.722998.704998.686998.668998.650998.632998.61318998.595998.576998.557998.539998.520998.501998.482998.463998.443998.42419998.404998.385998.365998.345998.325998.305998.285998.265998.244998.22420998.203998.182998.162998.141998.120998.099998.077998.056998.035998.01321997.
8、991997.970997.948997.926997.904997.882997.859997.837997.815997.79222997.769997.747997.724997.701997.678997.655997.631997.608997.584997.56123997.537997.513997.490997.466997.442997.417997.393997.396997.344997.32024997.295997.270997.246997.221997.195997.170997.145997.120997.094997.06925997.043997.01899
9、6.992996.966996.940996.914996.888996.861996.835996.80926996.782996.755996.729996.702996.675996.648996.621996.594996.566996.53927996.5996.4996.4996.4996.4996.3996.3996.3996.2996.21184562801734416886028996.231996.203996.174996.146996.117996.088996.059996.030996.001996.97229995.943995.913995.884995.854
10、995.825995.795995.765995.753995.705995.67530995.645995.615995.584995.554995.523995.493995.462995.431995.401995.37031995.339995.307995.276995.245995.214995.182995.151995.119995.087995.05532995.024994.992994.960994.927994.895994.863994.831994.798994.766994.73333994.700994.667994.635994.602994.569994.5
11、35的4502994.469994.436994.402I34994.369994.335994.301994.267994.234994.200994.166994.132994.098994.06335994.029993.994993.960993.925993.891993.856993.821993.786993.751993.71636993.681993.646993.610993.575993.540993.504993.469993.433993.397993.36137993.325993.280993.253993.217993.181993.144993.108993.072993.035992.99938992.962992.925992.888992.851992.814992.777
